Where does “Polija” come from?

Polija (Latvian) comes from Latvian Polis, from Polish polak, from Polish pole, from Old Polish pole, from Proto-Slavic pȍľe, from Proto-Indo-European pleh₂- — flat.

Ancestry of “Polija”, step by step

StepLanguageWordMeaning
1LatvianPolisa Pole, a Polish man, a man born in Poland
2PolishpolakPolish language
3Polishpolefield; outside; area
4Old Polishpolefield
5Proto-Slavicpȍľefield
6Proto-Indo-Europeanpleh₂-flat
Every word from Proto-Indo-European pleh₂- →Every word from Proto-Slavic pȍľe →Every word from Old Polish pole →