Type Word Usage Old Irish Meaning & History Old Irish word meaning "old" [1]. Related ItemsDetails Other Languages & Culturessenos(Old Celtic) hen(Old Welsh) Given Name DescendantsShana, Shanna, Shannen, Shannon, Shanon, Shannah(English) Fintan, Fionntan(Irish) Fintan, Sinann, Sionann(Irish Mythology) Fintan(Old Irish) Place Name DescendantsShannon, Sionainn(Irish) Sinainn(Old Irish) Same Spellingşen, sēn, sen 2 Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 330.