köken: Etymology tree Polish trzeba Proto-Slavic *-uxъ Old Polish -uch Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Balto-Slavic *-āˀ Proto-Slavic *-a Old Polish -a Old Polish -ucha Polish -ucha Polish trzebucha From trzeba + -ucha. Compare trzebula (“Anthriscus spp.; Scandix spp.”).