Welsh gwŷs

← Proto-Brythonic *gwɨs (inherited)

← Proto-Celtic *wissus (inherited)

← Proto-Celtic *wid-to-m (inherited)

← Welsh gwyddir (link)

← Welsh gwyddys (link)

← Proto-Indo-European *weyd- (root)

← Proto-Indo-European *wéydtus (inherited)

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

← Old Irish ·fess (cognate)

← Middle Breton gous (cognate)