Proto-Celtic *oinos

→ Breton un (inherited)

→ Breton unan (derived)

→ Welsh un (inherited)

→ Irish aon (inherited)

→ Irish Aonghas (derived)

→ Scottish Gaelic aon (inherited)

→ Scottish Gaelic Aonghas (inherited)

→ Manx un (derived)

→ Manx Anghus (derived)

→ Manx unnane (inherited)

→ Cornish onen (derived)

→ Cornish onan (derived)

→ Middle Irish Aengus (inherited)

→ Middle Irish óen (inherited)

→ Norwegian Bokmål aberdeen angus (derived)

→ Old Irish Oíngus (derived)

→ Old Irish óen (inherited)

→ Middle Welsh un (inherited)