Where does “персъ” come from?

персъ (Old Church Slavonic) comes from Ancient Greek Πέρσης, from Old Persian 𐎱𐎠𐎼𐎿, from Proto-Iranian párcuš, from Proto-Indo-Iranian párćuš, from Proto-Indo-European pérḱus — chest; rib.

Ancestry of “персъ”, step by step

StepLanguageWordMeaning
1Ancient GreekΠέρσηςa Persian
2Old Persian𐎱𐎠𐎼𐎿a Persian
3Proto-Iranianpárcušrib
4Proto-Indo-Iranianpárćušrib
5Proto-Indo-Europeanpérḱuschest; rib

Words derived from “персъ”

Every word from Proto-Indo-European pérḱus →Every word from Proto-Indo-Iranian párćuš →Every word from Proto-Iranian párcuš →