Anglicized form of Gaelic Ó Fathaidh or Ó Fathaigh meaning "descendant of Fathadh", a given name derived from the Gaelic word fothadh "base, foundation".This was sometimes mistakenly taken as the Gaelic word for "a green; a field", faithche, and consequently Anglicized as Green or Greene.
indicate the level to which a name has been verified.