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