French gain

← German Weide (cognate)

← French regain (cognate)

← Middle French gain (inherited)

← Old French gaaing (inherited)

← Old French gaaignier (mention)

← Old French gain (cognate)

← Proto-Germanic *waiþō (derived)

← Old High German weidanōn (cognate)

← Proto-Indo-European *weyh₁- (derived)

→ French guéder (link)