Cognomen Petrosyan (Петросян 
, Petrosyan 
, Петросьян ) , in all the world, is a common surname. The surname Petrosyan is habitual in Armenia, where it is a common surname, Russia, where it is quite a common surname, and Belarus, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Russia, Armenia, and Ukraine. Also, Petrosyan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Петросян | Kazakhstan, Armenia, Russia, Belarus, Ukraine |
| Petrosyan | Uzbekistan, Armenia, Russia, United States, France |
| Петросьян | Russia, Ukraine |
| פטרוסיאן | Israel |
Bedrosian, Bedrossian, Peter, Petrosian, Petrosjan, Petrossian, Петросиан, Петросйан, and Петьросян
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yuri petrosyan (b. 1941) |
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| mariam petrosyan artist, TR (b. 1912) |
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arevik petrosyan Armenian politician, AZ (b. 1964) |
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| arfo petrosyan AZ (b. 1909) |
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| eliz petrosyan (b. 1909) |
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| andranik petrosyan Armenian pedagogue, AZ (b. 1921) |
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| eghishe petrosyan TR (b. 1912) |
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gagik petrosyan Nagorno-Karabakh politician, AZ (b. 1973) |
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armenak petrosyan Armenian footballer, AM (b. 1973) |
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| pyotr petrosyan Armenian pedagogue, TM (b. 1924) |
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| suren petrosyan (b. 1921) |
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| h. z. petrosyan AZ (b. 1927) |
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| vladimir petrosyan Armenian sculptor, RU (b. 1941) |
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| valery petrosyan Azerbaijani chemist, AZ (b. 1942) |
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| g. petrosyan (b. 1934) |
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