Type Word Usage Old Irish Meaning & History Old Irish word meaning "valour" [1]. Related ItemsFamily Tree·Details Given Name DescendantsFarrell(English) Fearghal, Fergal, Ardal, Ardghal(Irish) Ardgal, Fergal(Old Irish) Surname DescendantsFarrell, Friel, Ó Fearghail, Ó Frighil(Irish) Same Spellinggal 1, gal 2 Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 149.