Where does “Լեհաստան” come from?

Լեհաստան (Armenian) comes from Armenian լեհ, from Middle Armenian լեհ, from Ottoman Turkish له, from Russian лях, from Old East Slavic лѧхъ, from Proto-Slavic lęxъ, from Proto-Slavic lęděninъ, from Proto-Slavic lędo — land, heath; loins.

Ancestry of “Լեհաստան”, step by step

Լեհաստան traces back through two separate lines of ancestry.

via Armenian լեհ

StepLanguageWordMeaning
1ArmenianլեհPole
2Middle ArmenianլեհPole
3Ottoman TurkishلهPole
4RussianляхPole, Polish man, Polack
5Old East SlavicлѧхъLechite; Pole
6Proto-Slaviclęxъ
7Proto-Slaviclęděninъdweller of wasteland / wold, virgin soil
8Proto-Slaviclędoheath, arid land, uncultivated field
9Proto-Indo-Europeanlendʰ-land, heath; loins

via Persian لهستان

StepLanguageWordMeaning
1Persianلهستانland of the Lechites
2Persianـستان-istan, -estan, -stan
3Middle Persian-stʾn'makes nouns of places; of indeterminate function
4Proto-Indo-IranianstáHnamthe act of standing; position, location, place
5Proto-Indo-Europeanstéh₂-no-m
6Proto-Indo-Europeansteh₂-to stand
Every word from Proto-Indo-European lendʰ-Every word from Proto-Slavic lędoEvery word from Proto-Slavic lęděninъ