Where does “pólko” come from?

pólko (Lower Sorbian) comes from Lower Sorbian pólo, from Proto-Slavic poľe, from Proto-Indo-European pleh₂- — flat.

Ancestry of “pólko”, step by step

StepLanguageWordMeaning
1Lower Sorbianpólofield
2Proto-Slavicpoľefield
3Proto-Indo-Europeanpleh₂-flat
Every word from Proto-Indo-European pleh₂- →Every word from Proto-Slavic poľe →Every word from Lower Sorbian pólo →
pólko — Etymology, Origin & Word History | Etymology Explorer