Where does “Polsko” come from?

Polsko (Czech) comes from Polish polska, from Old Polish Polska, from Proto-Slavic poľe, from Proto-Indo-European pleh₂- — flat.

Ancestry of “Polsko”, step by step

Polsko traces back through two separate lines of ancestry.

via Polish polska

StepLanguageWordMeaning
1Polishpolskafeminine nominative/vocative singular of polski
2Old PolishPolskaPoland
3Proto-Slavicpoľefield
4Proto-Indo-Europeanpleh₂-flat

via Polish polski

StepLanguageWordMeaning
1PolishpolskiPolish; Polish language lesson
2Old PolishpolskiPolish
3Proto-Slavicpoľьskъfield
Every word from Proto-Indo-European pleh₂- →Every word from Proto-Slavic poľe →Every word from Old Polish Polska →
Polsko — Etymology, Origin & Word History | Etymology Explorer