Muldoon is an Irish family name. It is represented throughout the world where descendants of emigrants of people bearing that name have settled; e.g. USA, Canada, Australia, New Zealand, South Africa and other countries. It is an anglicization of the Irish Ó Maoldúin, `descended from Maoldúin,` which in turn was a legendary first name. Also t.....
Muldoon is British slang for a spotty or acned person.
born 1921, New Zealand political leader: prime minister 1975–84.