Poghossian, Pogossyan, Poghosyan, Poghosian, Pogosyan, etc., (Armenian: Պողոսյան) is an Armenian surname.
Also Ter-Pogossian, Der-Pogossian, and variants.
Ter/Der indicates priesthood descent.
The Western Armenian equivalent is Boghossyan.
It is a patronymic from the first name Poghos (Armenian: Պողոս), equivalent to Paul, making the name effectively equivalent to Paulson.