Where does “petroșeneancă” come from?

petroșeneancă (Romanian) comes from Romanian petroșenean, from Romanian Petroșani, from Romanian Petros, from Romanian piatră, from Latin petra, from Ancient Greek πέτρα — rock formation: cliff, ledge, cave, ridge; stone.

Ancestry of “petroșeneancă”, step by step

Step	Language	Word	Meaning
1	Romanian	petroșenean	—
2	Romanian	Petroșani	—
3	Romanian	Petros	—
4	Romanian	piatră	stone
5	Latin	petra	stone, rock
6	Ancient Greek	πέτρα	rock formation: cliff, ledge, cave, ridge; stone

Every word from Ancient Greek πέτρα →Every word from Latin petra →Every word from Romanian piatră →