Where does “Moriarty” come from?

Moriarty is the Anglicized form of the Irish surname Ó Muircheartaigh, derived from a Gaelic personal name of uncertain origin and meaning.

Ancestry of “Moriarty”, step by step

Step	Language	Word	Meaning
1	Irish	Ó Muircheartaigh	—

Moriarty — Etymology, Origin & Word History | Etymology Explorer