Type Word Usage Old Irish Meaning & History Old Irish word meaning "demon, evil spirit" [1]. Related ItemsFamily Tree·Details Given Name DescendantsMorrígan, Mórríghan, Mór-Ríoghain(Irish Mythology) Same Spellingmór 1, mór 2, mor 1, mor 2 Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 278.