Welsh bugail

← Breton bugel (cognate)

← Proto-Brythonic *bʉgöl (inherited)

← Proto-Celtic *boukolyos (inherited)

← Irish buachaill (cognate)

← Scottish Gaelic buachaille (cognate)

← Ancient Greek βουκόλος (cognate)

← Manx bochil (cognate)

← Proto-Indo-European *gʷowkólos (inherited)

← Proto-Indo-European *gʷṓws (mention)

← Proto-Indo-European *kʷel- (mention)

← Cornish bugel (cognate)

→ Breton bugel (cognate)

→ Irish buachaill (cognate)