Welsh crynu

← Breton krenañ (mention)

← Proto-Celtic *krini- (derived)

← Proto-Indo-European *krey- (derived)

← Cornish krena (cognate)

← Cornish kerna (mention)

← Old Irish ara·chrin (cognate)

← Middle Breton crenaff (cognate)

→ Welsh Crynwr (affix)

→ Welsh crŷn (mention)

→ Welsh cryndod (affix)

→ Old Irish arachrin (cognate)