Primitive Irish ᚐᚃᚔ

← Proto-Celtic *awyos (inherited)

← Gothic 𐌰𐍅𐍉 (cognate)

← Proto-Indo-European *h₂ewh₂yos (inherited)

← Latin avus (cognate)

← Old Prussian awis (cognate)

← Old Armenian հաւ (cognate)

→ Manx oe (inherited)

→ Old Irish úa (inherited)