Type Word Usage Old Irish Meaning & History Old Irish word meaning "son" [1]. Related ItemsFamily Tree·Details Other Languages & Culturesmakwos(Old Celtic) Given Name DescendantsMacbeth(History) Macdara(Irish) Mac Beatha(Medieval Scottish) Macdara(Old Irish) Surname DescendantsMacBay, MacBeth(Scottish) Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 253.