Updated June 9, 2019 Share: Boy name origins & meanings Welsh, German : Rejoicer; fort; joyful Boy name variations Kay Kay + 10% this year Neutral Rare Find out more Kai Kai + 14% this year Neutral Common Find out more Kaye Kaye + 15% this year Masculine Rare Find out more Kaysie Kaysie - 13% this year Neutral Rare Find out more Keh Keh 0 % this year Masculine Rare Find out more How Popular Is The Name MacKay Family name origins & meanings Scottish and Irish : see McKay.