Polish klej

← German Kleister (mention)

← Proto-Germanic *klajjaz (mention)

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

→ Bulgarian клей (cognate)

→ Polish kleić (suffix)

→ Polish klejówka (affix)

→ Polish klejek (affix)

→ Polish kleisty (affix)

→ Romanian clei (cognate)

→ Russian клей (cognate)

→ Yiddish קליי (borrowed)