Where does “ptasiuk” come from?

ptasiuk (Polish) comes from Polish Ptak, from Old Polish ptak, from Proto-Slavic pъtakъ, from Proto-Slavic pъta, from Proto-Indo-European peth₂- — to spread out; to fly.

Ancestry of “ptasiuk”, step by step

StepLanguageWordMeaning
1PolishPtakbird
2Old Polishptakbird
3Proto-Slavicpъtakъbird
4Proto-Slavicpъtabird
5Proto-Indo-Europeanpeth₂-to spread out; to fly
Every word from Proto-Indo-European peth₂- →Every word from Proto-Slavic pъta →Every word from Proto-Slavic pъtakъ →