Aslan - From Arabian arslan which means "lion". Due to Turkish assimilation it was changed into aslan. We also have the surname Aslanyan. 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).