(Meath and Monaghan) Anglicized form of Gaelic Ó
Muircheartaigh ‘descendant of Muircheartach’, a personal
name from muir ‘sea’ + ceardach ‘skilled’, i.e. ‘skilled
navigator’. A Kerry surname of the same form is Anglicized as
Moriarty.
(County Roscommon) Anglicized form of Mac
Muircheartaigh (originally Anglicized as MacMoriarty) (see
McMurtry).
(Ulster): sometimes of Scottish origin, an
alternative to Murdock.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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