Dempsey is an Irish surname, an anglicization of O'Diaomasaigh. This means "descendent of Diaomasach," which comes from a name meaning "proud."Dempsey
(demp-see) first began liking this name when there was a guy in the cure back in the early 80s named michael dempsey (not a major player or anything, so it's kind of funny that the name has stuck with me). it's a normal last name, but probably a pretty uncommon first name.
Dempsey is an Irish surname, an anglicization of O'Diaomasaigh. This means "descendent of Diaomasach," which comes from a name meaning "proud."