Type Word Usage Old Irish Meaning & History Old Irish word meaning "sea" [1]. Related ItemsDetails Other Languages & Culturesliros(Old Celtic) lirou(Old Welsh) Given Name DescendantsLer, Lir(Irish Mythology) Same Spellingler 1 Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 241.