Kai

Kai is a name found independently across several language families, making its origins unusually diverse. In Hawaiian it means sea, in Japanese it carries meanings including shell or ocean depending on the kanji used, and in Welsh it derives from the Latin Caius, meaning rejoice. In Frisian and Scandinavian traditions it is considered a short form of Nikolai or Katharina, while in Chinese contexts it can mean victory or triumphant. The name appears in Arthurian legend as Sir Kay, one of the Knights of the Round Table, and related forms include Kay, Cai, and Caius.