They were used as the official names during the early era of the Ryukyu Kingdom .
They were the oldest component of Okinawan names as , like people in mainland Japan , the inhabitants of Ryukyu islands did not originally have names for families , clans or lineages .
inhabitants were used as the official names during the early era of the Ryukyu Kingdom .
They were the oldest component of Okinawan names as , like people in mainland Japan , the inhabitants of Ryukyu islands did not originally have names for families , clans or lineages .