Where does “dubisko” come from?

dubisko (Czech) comes from Czech dub, from Old Czech dub, from Proto-Slavic dǫbъ, from Proto-Indo-European dʰanw-.

Ancestry of “dubisko”, step by step

StepLanguageWordMeaning
1Czechduboak, oak tree
2Old Czechduboak, oak tree
3Proto-Slavicdǫbъoak tree; oak
4Proto-Indo-Europeandʰanw-—
Every word from Proto-Indo-European dʰanw- →Every word from Proto-Slavic dǫbъ →Every word from Old Czech dub →