Kin is the Japanese word for "gold." A common Japanese name for males is Ken, meaning "healthy." It is pronounced the same as Barbie's friend's name. Both are used in combination with other characters to create longer names, such as Kinji and Kentaro. You might try both spellings (Kin/Ken) since phonetic transliterations sometimes confuse English vowels. Proper romanization uses Italian vowels (a Jesuit influence).