Updated June 9, 2019 Share: Boy name origins & meanings Spanish : Resolute, protector Boy name variations Guillermo Guillermo - 4% this year Masculine Rare Find out more Guillaume Guillaume 0 % this year Masculine Rare Find out more Guilherme Guilherme - 30% this year Masculine Rare Find out more Gillermo Gillermo 0 % this year Masculine Rare Find out more Gughilmo Gughilmo 0 % this year Masculine Rare Find out more Gwillyn Gwillyn 0 % this year Masculine Rare Find out more William William - 7% this year Masculine Common Find out more