Type Word Usage Old Welsh Meaning & History Old Welsh word meaning "sea" [1] . Related ItemsFamily Tree ·Details Other Languages & Culturesmori (Old Celtic) muir (Old Irish) Given Name DescendantsMorgaine, Morgan, Morgen (Arthurian Cycle) Morgane (French) Muirín (Irish) Muirgen (Irish Mythology) Same Spellingmór 1, mór 2, mor 1, mor 3, mor 4 Sources & ReferencesShow Inline Numbers Hide Inline Numbers Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 277. Share on Facebook Share on Twitter Entry updated May 26, 2026