dempsey

noun

1. JackWilliam Harrison Dempsey, 1895–1983, U.S. boxer: world heavyweight champion 1919–26.

noun

1. Jack. real name William Harrison Dempsey. 1895–1983, US boxer; world heavyweight champion (1919–26)

surname, from Irish Ó Diomasaigh “descendant of Diomasach,” literally “proud.”