Where does “Petia” come from?

Petia (Romanian) comes from Russian Петя, from Russian Пётр, from Koine Greek Πέτρος, from Ancient Greek Πέτρος, from Ancient Greek πέτρος — rock, stone, boulder; type of reed.

Ancestry of “Petia”, step by step

Step	Language	Word	Meaning
1	Russian	Петя	—
2	Russian	Пётр	Peter; {{w\|Peter the Great}}
3	Koine Greek	Πέτρος	—
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 Koine Greek Πέτρος →