His real name was the same as a famous Japanese naval officer and because of security reasons , they decided to use his wife 's family name .
It was at that time that the Nakayama family used the name Nakayama .
Nakayama 's real name was the same as a famous Japanese naval officer and because of security reasons , they decided to use his wife 's family name .
It was at that time that the Nakayama family used the name Nakayama .