Welsh gwas

← Breton gwaz (cognate)

← Proto-Celtic *wastos (inherited)

→ English vassal (cognate)

→ English valet (cognate)

→ Breton gwaz (cognate)

→ Welsh heddwas (compound)

→ Welsh gwasanaeth (suffix)

→ French vassal (cognate)

→ French valet (cognate)

→ Latin vassallus (cognate)

→ Cumbric gos (cognate)