Where does “Pierre” come from?

Pierre (Old French) comes from Latin petra, from Ancient Greek πέτρα — rock formation: cliff, ledge, cave, ridge; stone.

Ancestry of “Pierre”, step by step

Step	Language	Word	Meaning
1	Latin	petra	stone, rock
2	Ancient Greek	πέτρα	rock formation: cliff, ledge, cave, ridge; stone

Pierre — Etymology, Origin & Word History | Etymology Explorer