Welsh hwyl

← Old English seġl (borrowed)

← Breton gouel (cognate)

← Proto-Brythonic *huɨl (inherited)

← Welsh gŵyl (mention)

← Proto-Germanic *seglą (derived)

← Old Norse segl (borrowed)

→ Breton gouel (cognate)

→ Welsh hwylbren (compound)

→ Welsh hwylio (suffix)

→ Welsh hwyliau (affix)