Where does “persille” come from?

persille (Middle Irish) comes from Old French peresil, from Latin petroselīnum, from Ancient Greek πετροσέλινον, from Ancient Greek Πέτρος, from Ancient Greek πέτρος — rock, stone, boulder; type of reed.

Ancestry of “persille”, step by step

Step	Language	Word	Meaning
1	Old French	peresil	—
2	Latin	petroselīnum	rock parsley
3	Ancient Greek	πετροσέλινον	parsley
4	Ancient Greek	Πέτρος	Peter
5	Ancient Greek	πέτρος	rock, stone, boulder; type of reed

Every word from Ancient Greek πέτρος →Every word from Ancient Greek Πέτρος →Every word from Ancient Greek πετροσέλινον →