Floyd Mayweather Biography Floyd Joy Mayweather, Jr. born on Floyd Sinclair on February 24, 1977, is an American professional boxer. He is the son of Floyd Mayweather, Sr. From July 18, 2005 through June 2, 2008 he was rated by The Ring magazine as the number-two pound for pound boxer in the world. Floyd Mayweather, Jr. was born in Grand Rapids, Michigan, with his mother's last name. His last n... more.