Cai (surname)
Cài (Chinese: 蔡) is a Chinese-language surname that derives from the name of the ancient Cai state. In 2019 it was the 38th most common surname in China, but the 9th most common in Taiwan (as of 2018), where it is usually romanized as "Tsai" (based on Wade-Giles romanization of Standard Mandarin), "Tsay", or "Chai" and the 8th most common in Singapore, where it is usually romanized as "Chua", which is based on its Teochew and Hokkien pronunciation. Koreans use Chinese-derived family names and in Korean, Cai is 채 in Hangul, "Chae" in Revised Romanization, It is also a common name in Hong Kong where it is romanized as "Choy", "Choi" or "Tsoi". In Macau, it is spelled as "Choi". In Malaysia, it is romanized as "Choi" from the Cantonese pronunciation, and "Chua" or "Chuah" from the Hokkien or Teochew pronunciation. It is romanized in the Philippines as "Chua" or "Chuah", and in Thailand as "Chuo" (ฉั่ว). Moreover, it is also romanized in Cambodia as either "Chhay" or "Chhor" among people of full Chinese descent living in Cambodia and as “Tjhai”, "Tjoa" or "Chua" in Indonesia.

History
The Chois are said to be the descendants of the 5th son of King Wen of Zhou, Ji Du. Ji Du was awarded the title of marquis (hóu) of the State of Cai (centered on what is now Shangcai, Zhumadian, Henan, China), and he was known as Cai Shu Du ("Uncle Du of Cai"). Together with Guan Shu and Huo Shu, they were known as the Three Guards. When King Wu died, his son King Cheng was too young and his uncle, the Duke of Zhou, became regent. Seeing that the power of the Duke of Zhou was increasing, the Three Guards got jealous and rebelled against Zhou together with Wu Geng. The Duke of Zhou suppressed the rebellion, and Cai Shu was exiled. King Cheng reestablished Cai Shu's son Wu or Hu as the new Duke of Cai. Some 600 years later in the Warring States period, the State of Chu conquered Cai in 447 BC and was itself conquered by the Qin state which, in turn, formed the Qin Empire, China's first empire. With the spread of family names to all social classes in the new empire, many people of the former state of Cai began to bear it as a surname.
The Cai descendants have undertaken the following two major migrations. During the Huang Chao Rebellion (AD 875) at the end of the Tang dynasty (AD 618–907), the Cai clan migrated to Guangdong and Fujian provinces. Another later migration occurred when Ming dynasty loyalist Koxinga moved military officials surnamed Cai and their families to Taiwan in the 17th century. As a result, the surname is far more common in these areas and in areas settled by their descendants (e.g., Southeast Asia) than in other parts of China.

Transliteration and romanization
Chinese
Cai is written the same (蔡) in both simplified and traditional Chinese characters.
In Mandarin Chinese, the surname is transliterated as Cài in pinyin and Tongyong Pinyin, Ts'ai in Wade-Giles, and Tsay in Gwoyeu Romatzyh. In Southern Min or Taiwanese, it is Chhoà in Pe̍h-oē-jī. In Cantonese (Hong Kong and Macau), it is Coi3 in Jyutping and Choi in Yale. (This should not be confused with the predominantly Korean family name Choi which has a different character [崔]). In Hakka it is Tshai in Pha̍k-fa-sṳ. (In Tongyong pinyin, it is Cai in Siyen Hakka and Ca̱i in Hoiliuk Hakka.) In Fuzhou dialect, it is Chái (in Bàng-uâ-cê).

Other languages
Koreans use Chinese-derived family names and in Korean, Cai is 채 in Hangul, Chae in Revised Romanization, and Ch'ae in McCune-Reischauer.
Vietnamese also use Chinese-derived family names. In Vietnamese, the name is Thái. The Chinese name 蔡 is usually transliterated via Sino-Vietnamese as Thái but sometimes as Sái.
Japanese do not use Chinese family names but for Chinese in Japan who carry the name, it is さい in Hiragana and Sai in the major romanization systems.

Romanization
Cai is romanized as Cai in the People's Republic of China, Tsai (or occasionally Tsay or Chai for Mandarin) or Tsoa in Taiwan, and Choi or Choy in Hong Kong and Malaysia. In Malaysia, Singapore, and Brunei, the most common forms are Chua or Chuah for Teochew and Hokkien speakers, Chai for Hakka speakers, Choi or Tsoi for Cantonese speakers, and Toy or Toi for Taishanese speakers. In Indonesia, it is usually romanized as Tjoa/Tjhoa/Tjoea/Tjhoea (Hokkien & Teochew), Tjhoi (Cantonese) or Tjhai (Hakka) with Dutch spelling, or Tjua/Tjhua (Hokkien & Teochew) with old Indonesian spelling, or Chua (Hokkien & Teochew), Choy/Choi (Cantonese) or Chai (Hakka) with current Indonesian spelling. In the Philippines, it is Chua /ˈtʃuwa/ or Cua (/'kuwa/ or /kwa/). Chua is pronounced /ˈtʃwa/ in other Anglophone countries outside the Philippines.
Other variations include Chye and Coi.

Derivative names
In addition, some of the Chuas (Cais) who resided in the Philippines adopted Spanish names to avoid persecution by the Spanish rulers during the Philippines' Spanish colonial rule from the early 16th to late 19th century. Hispanicized forms of the name include Chuachiaco, Chuakay, Chuapoco, Chuaquico, Chuacuco, Tuazon, Chuateco, and Chuatoco. These names were formed from the surname, one character of the given name, and the suffix "-co", a Minnan honorific ko (哥), literally meaning "older brother".In Thailand, most Thais of Chinese descendance use Thai surnames. Legislation by Siamese King Rama VI (r. 1910–1925) required the adoption of Thai surnames which was largely directed at easing tensions with Chinese community by encouraging assimilation. Thai law did not (and does not) allow identical surnames to those already in existence, so ethnic Chinese formerly surnamed Chua incorporating words that sound like "Chua" and have good meaning (such as Chai, meaning "victory") into much longer surnames.
After Suharto came to power, his regime created many anti-Chinese legislations in Indonesia. One of them was 127/U/Kep/12/1966 which strongly encouraged ethnic Chinese living in Indonesia to adopt Indonesian-sounding names instead of the standard three-word or two-word Chinese names. Many Indonesianized names are Chinese surname syllables with western or Indonesian prefix or suffix – resulting in many exotic-sounding names. Although two Chinese individuals shared the same Chinese surname, they may employ different strategies for the Indonesian-sounding names. For example, Indonesianized forms of Cai include Tjuatja, Cuaca, Tjuandi, Cuandi, Tjahjana, Tjahja, etc. Despite the Indonesianization, the Chinese surnames are still used today by the Chinese-Indonesian diaspora overseas (mostly in the Netherlands, Germany, and USA); by those Chinese-Indonesians courageous enough during Suharto's regime to keep their Chinese names (e.g., Kwik Kian Gie), or by those who couldn't afford to process the name change through Indonesia's civil bureaucracy. After Suharto resigned from the presidency, subsequent governments revoked the ban on the ethnic Chinese from speaking and learning Chinese in public. Using the original Chinese surnames is no longer a taboo but only a small minority have decided to re-adopt the original Chinese surnames of their grandparents or to use the Mandarin Chinese pinyin romanization, pronunciation and spelling and most retain their changed names as the post-1965 generations have been culturally Indonesianized.

Notable people
Cai Cheng, a Chinese politician
Cai Chusheng, an early Chinese film director
Cai E, a Chinese revolutionary and warlord in early 20th century
Cai Feihu, Chinese professor, engineer and businessman
Cai Gongshi, a Chinese emissary killed by Japanese soldiers during the Jinan Incident
Cai Guo-Qiang, a Chinese contemporary artist and curator.
Cai Hesen, an early leader of the Chinese Communist Party and a friend and comrade of Mao Zedong
Cai Jing, a Song dynasty official and a character in the Chinese literature classic the Water Margin
Lady Cai, the wife of Han dynasty provincial governor Liu Biao
Cai Lun, the inventor of paper in the Han dynasty
Cai Mao, a man of the gentry who served under Han dynasty provincial governor Liu Biao, cousin of Cai He and Cai Zhong
Cai Pei, a diplomat and politician in the Republic of China
Cai Qi, a Chinese politician
Cai Qian, a Chinese pirate in the Qing dynasty
Cai Shangjun, a Chinese film director and screenwriter
Cai Shu, a Chinese high jumper
Cai Tingkai, a Chinese general during the Republican era
Cai Wenji, a Han dynasty poet and composer also known as Cai Yan, daughter of scholar Cai Yong
Cai Xiang, a calligrapher, scholar, official and poet during the Song dynasty also known as Cai Zhonghui
Cai Xitao, a Chinese botanist
Cai Xukun, a Chinese actor, singer and song composer, former leader and center of Chinese boy group Nine Percent
Cai Xuzhe, a Chinese astronaut
Cai Yong, a Han dynasty scholar and father of Cai Wenji
Cai Yuanpei, a chancellor of Peking University and first president of the Chinese Academy of Sciences (Academic Sinica)
Cai Yun, a Chinese badminton player
Cai Zhuohua, a Chinese Christian preacher
Chae Je-gong, a Joseon dynasty scholar, writer, politician
Chae Myung-shin, a South Korean army officer
Chae Su-chan, a South Korean politician and scholar
Chai Trong-rong or Trong Chai, a Taiwanese politician
Ada Choi, a Hong Kong actress
Charlene Choi, a Hong Kong singer, member of the Twins duo
Christine Choi, Secretary of Education in Hong Kong
Choi Chi-sum, a Hong Kong evangelist
Choi Kwok-wai, a Hong Kong actor
Fátima Choi, a Macanese government minister
Sandra Choi, an English creative director and designer for shoemaker Jimmy Choo Ltd
Sisley Choi, a Hong Kong actress
Richard Tsoi, a Hong Kong activist and polictican
Vin Choi, a Hong Kong actor
Choi York Yee, a Hong Kong footballer and sports commentator
Anna Choy, an Australian actress, TV presenter, and Australia Day Ambassador
Elizabeth Choy, a North Borneo-born Singaporean World War II heroine
Choy So-yuk, a Hong Kong politician
Choy Weng Yang, a Singaporean artist
Alfrancis Chua, a Filipino basketball coach
Amy Chua, an American academic and author of Filipino Chinese descent
Brent Chua, a Filipino model
Dexmon Chua, Singaporean murder victim
Chua Ek Kay, a Singaporean artist
Chua En Lai (born 1979), a Singaporean actor
Glen Chua, a Canadian film director, actor, and writer
Joi Chua (Joi Tsai), a Singaporean singer
Jonathan Chua (Jon Chua JX / Jonny X), a Singaporean musician & entrepreneur
Dino Reyes Chua, a Filipino politician and the current mayor of Noveleta, Cavite
Chua Jui Meng (born 1943), a Malaysian health minister and prominent politician
Chua Lam, a Singaporean-born Hong Kong columnist and movie producer
Chua Leong Aik, Singaporean murder accomplice
Leon O. Chua, an American professor and inventor of Chua's circuit
Simon Chua Ling Fung, a bodybuilder from Singapore
Mark Welson Chua, a Filipino murder victim
Paige Chua (born 1981), a Singaporean model and actress
Paul Chua, a Singaporean bodybuilder
Chua Phung Kim, a Singaporean weightlifter
Robert Chua, a Singapore-born Asian television executive
Chua Ser Lien, Singaporean kidnapper
Chua Sock Koong, a Singaporean telecom executive
Chua Soi Lek, a Malaysian health minister and prominent politician, former Member of Parliament for Labis
Chua Soon Bui, a Malaysian politician
Tanya Chua, a Singaporean singer
Chua Tee Yong, a Malaysian politician, former Member of Parliament for Labis
Chua Tian Chang, or Tian Chua, a Malaysian politician, former Member of Parliament for Batu
Chua Yee Ling, a Malaysian politician, former Member of Perak State Assembly for Kuala Sapetang
Chua Wei Kiat, a Malaysian politician, Member of Selangor State Assembly for Rawang and State Chairman for AMK's Selangor Chief
Xiao Chua, a Filipino historian
Tricia Chuah, a Malaysian squash player
Chuah Guat Eng, a Malaysian novelist
Hirokazu Nakaima, Governor of Okinawa Prefecture; Nakaima is descended from a Chinese family with the surname of Cai, one of the 36 Han Chinese Kumemura families who moved to Okinawa in 1392.
Sai On, a scholar-bureaucrat official of the Ryūkyū Kingdom
Sai Taku, a scholar-bureaucrat official of the Ryūkyū Kingdom
David Thai, a Vietnamese-American gangster
Minh Thai, a Vietnamese-American speedcuber
Thái Phiên, a Vietnamese scholar and revolutionary
Thái Quang Hoàng, a lieutenant general in the Army of the Republic of Vietnam
Thái Thanh, a Vietnamese-American singer
Thái Văn Dung, a Vietnamese Catholic activist
Vico Thai, a Vietnamese-Australian actor
Tjoa Ing Hwie or Tjoa Jien Hwie, the birth name of Surya Wonowidjojo, founder of Gudang Garam
Marga Tjoa, the real name of Indonesian writer Marga T
Tjoa To Hing, the birth name of Indonesian businessman Rachman Halim
Alex Tsai, a Taiwanese politician
Tsai Chia-Hsin, a Taiwanese badminton player
Tsai Chih-chieh, a Taiwanese footballer (soccer player)
Tsai Chih-Ling, American business professor and author
Tsai Chih Chung, a Taiwanese cartoonist
Tsai Chin, a Taiwanese popular music singer
Tsai, Emilio Estevez, a Canadian soccer player
Tsai Horng Chung, a Chinese-Sarawakan painter
Tsai Hsien-tang, a Taiwanese footballer
Tsai Hui-kai, a Taiwanese footballer (soccer player)
Tsai Ing-wen, president and former vice premier of Taiwan
Tsai Li-huei, a Taiwanese born American neuroscientist
Tsai Ying-wen, a Taiwanese Political scientist
Jeanne Tsai, an American academic
Jolin Tsai, a Taiwanese pop singer
Joseph Tsai, a Canadian businessman, lawyer and philanthropist
Kevin Tsai, a Taiwanese writer and television host
Lauren Tsai, an American illustrator, model, and actress
Tsai Min-you, the real name of a Taiwanese singer Evan Yo
Ming Tsai, an American chef and host of television cooking shows
Tsai Mi-ching, Deputy Minister of Science and Technology of the Republic of China
Tsai Ming-Hung, a Taiwanese baseball player
Tsai Ming-liang, a Taiwanese movie director
Tsai Ping-kun, Deputy Mayor of Taipei
Tsai Sen-tien, Vice Minister of Health and Welfare of the Republic of China (2016–2017)
Tsai Shengbai, a Chinese industrialist
Stephen W. Tsai, an American engineer
Tsai Wan-chun, a Taiwanese politician and founder of Cathay Life Insurance Company; brother of Tsai Wan-lin and Tsai Wan-tsai (qq.v.) and father of Tsai Chen-chou and Tsai Chen-nan (businessman)
Tsai Wan-lin, a Taiwanese billionaire and founder of Cathay Life Insurance Company; brother of Tsai Wan-chin and Tsai Wan-tsai (qq.v.) and father of Tsai Hong-tu and T. Y. Tsai
Tsai Wan-tsai, a Taiwanese billionaire, member of the Legislative Yuan and founder of Fubon Group; brother of Tsai Wan-chin and Tsai Wan-lin (qq.v.) and father of Daniel Tsai and Richard Tsai
Will Tsai, a Canadian magician
Tsai Yi-chen, a Taiwanese actress
Yu Tsai, an American photographer

See also
All pages with titles beginning with Cai
All pages with titles containing Cai
Cai (disambiguation)
Category:Tsai family of Miaoli, a prominent Taiwanese family
Choa Chu Kang (蔡厝港 Càicuògǎng, literally "Cai house harbor"), a suburban area in the West Region of Singapore
Choi Uk Tsuen (蔡屋村 Càiwùcūn, literally "Cai house village"), a village in the Yuen Long district of Hong Kong
Choy Gar (蔡家拳 Càijiāquán, literally "Cai family fist"), a Chinese martial art that was created by Choy Gau Yee (蔡九儀)
Choy Li Fut (蔡李佛拳 Càilǐfóquán, literally "Cai, Li, and Buddha's fist"), a Chinese martial arts system named to honor the Buddhist monk Choy Fook (蔡褔) among others
Choy Yee Bridge stop (蔡意橋站), a MTR Light Rail stop in Hong Kong
2240 Tsai, an asteroid named after Taiwanese astronomer Tsai Changhsien

References
External links
Chua Clan Chiyang Association, Muar, Johor, Malaysia (馬來西亞柔佛麻坡蔡氏濟陽公所) website (in Chinese)