Breton kuñv

← Proto-Brythonic *kʉβ̃ (inherited)

← Proto-Celtic *koimos (inherited)

← Welsh cu (cognate)

← Proto-Indo-European *ḱóymos (inherited)

← Old Breton cum (inherited)

→ Breton tad-kuñv (affix)

→ Welsh cu (cognate)

→ Old Irish cóem (cognate)