Where does “Petrosyan” come from?

Petrosyan (English) comes from Armenian Պետրոսյան, from Armenian Պետրոս, from Old Armenian Պետրոս, from Ancient Greek Πέτρος, from Ancient Greek πέτρος — rock, stone, boulder; type of reed.

Ancestry of “Petrosyan”, step by step

Step	Language	Word	Meaning
1	Armenian	Պետրոսյան	—
2	Armenian	Պետրոս	Peter
3	Old Armenian	Պետրոս	Peter
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 Old Armenian Պետրոս →