Welsh can-

← Proto-Brythonic *kanta- (inherited)

← Welsh gan (mention)

← Ancient Greek κατά (cognate)

← Proto-Indo-European *ḱm̥-teh₂ (derived)

← Proto-Indo-European *ḱóm (mention)

→ Welsh cynhorthwy (affix)

→ Welsh canlyn (prefix)

→ Welsh canfod (affix)

→ Welsh cynnal (affix)

→ Welsh caniatáu (prefix)

→ Welsh canmol (affix)