Where does “dwulist” come from?

dwulist (Polish) comes from Polish dwu-, from Proto-Slavic dъva, from Proto-Balto-Slavic duwō, from Proto-Indo-European dwóh₁ — two.

Ancestry of “dwulist”, step by step

StepLanguageWordMeaning
1Polishdwu-double; two
2Proto-Slavicdъvatwo
3Proto-Balto-Slavicduwōtwo
4Proto-Indo-Europeandwóh₁two
Every word from Proto-Indo-European dwóh₁ →Every word from Polish dwu- →Every word from Proto-Balto-Slavic duwō →