Welsh nef

← Breton neñv (cognate)

← Proto-Brythonic *neβ̃ (inherited)

← Proto-Celtic *nemos (inherited)

← Irish neamh (cognate)

← Proto-Indo-European *nébʰos (inherited)

← Cornish nev (cognate)

← Old Welsh nem (inherited)

← Middle Welsh new (inherited)

→ Breton neñv (cognate)

→ Welsh nefol (affix)

→ Irish neamh (cognate)

→ Cornish nev (cognate)