Proto-Celtic *abū

→ English ape (cognate)

→ English Aberdeen (derived)

→ Aragonese ibón (cognate)

→ Welsh afon (inherited)

→ Welsh afanc (mention)

→ Spanish ibón (cognate)

→ French aven (derived)

→ Old French Amiens (derived)

→ Irish abhainn (inherited)

→ Scottish Gaelic abhainn (inherited)

→ Galician abeneiro (derived)

→ Galician ámboa (derived)

→ Galician Abanqueiro (derived)

→ Galician vaira (derived)

→ Galician A Baña (derived)

→ Manx awin (inherited)

→ Latin Avenio (cognate)

→ Latin Genabum (mention)

→ Middle Irish ab (inherited)

→ Middle Irish abacc (mention)

→ Norwegian Bokmål aberdeen angus (derived)

→ Portuguese Ave (mention)

→ Portuguese Dão (mention)

→ Old Irish aub (inherited)