Frequency: (373)
(number of times this surname appears in a sample database of 88.7 million names, representing one third of the 1997 US population)
Irish: Anglicized form of Gaelic Mac Murchadha, a patronymic from the personal name Murchadh ‘sea warrior’, from muir ‘sea’ + cath ‘battle’. Compare McMorrow, McMurdo.
See the Key to the Dictionary or consult the General Introduction for further explanation.




