The name Moriarty is an Anglicized version of the Irish name Ó Muircheartaigh [oː ˈmˠɪɾʲɪçaɾˠt̪ˠiː] which originated in County Kerry in Ireland. Ó Muircheartaigh can be translated to mean 'navigator' or 'sea worthy', as the Irish word muir means sea ( cognate to the Latin word mare for 'sea') and ceardach means skilled. [ 2 ] More @Wikipedia
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