- Murphy is an Anglicized version of two Irish surnames: Ó Murchadha/Ó Murchadh ("descendant of Murchadh"), and Mac Murchaidh/Mac Murchadh ("son of Murchadh")derived from the Irish personal name Murchadh, which meant "sea-warrior" or "sea-battler". (Muir meaning "sea" and cath meaning "battle".
- Spelling variations include Murphey, MacMurphy, MacMurrough, O'Morchoe and others. In modern Irish, "Ó Murchú", rather than "Ó Murchadha", is used.
- Murphy is the most common surname in Ireland and the fifty-eighth most common surname in the United States
Murphy profiles on Geni
Patrick B. Murphy 1852-1935 (Private tree)