Welsh cach

← Proto-Brythonic *kax (inherited)

← Proto-Celtic *kakkos (inherited)

← Proto-Celtic *kakkā (mention)

→ English caca (cognate)

→ Welsh cachlwyth (affix)

→ Welsh cacwn (compound)

→ Welsh cachgi (compound)

→ Welsh cachgwn (compound)

→ Galician caca (cognate)