Updated June 9, 2019 Share: Girl name origins & meanings Japanese : Gratitude Boy name origins & meanings Japanese : LawLatin : King Boy name variations Rex Rex - 1% this year Masculine Rare Find out more Roi Roi - 9% this year Masculine Rare Find out more Rexford Rexford - 14% this year Masculine Rare Find out more Rexer Rexer 0 % this year Masculine Rare Find out more How Popular Is The Name Rei