Ashot - According to M. Khorenatsi the base of this name is Old Jewish word asud. The Arabian word ashath is also of Semitic origine. The name Ashot is wide-spread in Arm. Petrosyan - Petrosyan, Petrosian or Petrossian (Eastern Armenian), Bedrosian or Bedrossian (Western Armenian) is a common surname in Armenia.
It is a patronymic from the Armenian first name Petros (equivalent to Peter).