ionann

alike, Irish ionnan, Old Irish inonn, innon, inon. Possibly for *sin-ôn, *sin-sôn, "this-that"; See sin, and sôn of Old Irish is for *sou-n, *sou, hoc, Greek $$Gou$$`$$n-tos (for root, See -sa). Cf. for form Latin idem = is-dem, Greek $$Go$$` au$$'tós.