Where does “tatarstan” come from?

tatarstan (Portuguese) comes from Russian Татарста́н, from Tatar Татарстан, from Persian تاتارستان, from Persian ـستان, from Middle Persian -stʾn', from Proto-Indo-Iranian stáHnam, from Proto-Indo-European stéh₂-no-m, from Proto-Indo-European steh₂- — to stand.

Ancestry of “tatarstan”, step by step

StepLanguageWordMeaning
1RussianТатарста́н—
2TatarТатарстан—
3Persianتاتارستان—
4Persianـستان-istan, -estan, -stan
5Middle Persian-stʾn'makes nouns of places; of indeterminate function
6Proto-Indo-IranianstáHnamthe act of standing; position, location, place
7Proto-Indo-Europeanstéh₂-no-m—
8Proto-Indo-Europeansteh₂-to stand
Every word from Proto-Indo-European steh₂- →Every word from Proto-Indo-European stéh₂-no-m →Every word from Middle Persian -stʾn' →