Penov is a male ending... The female ending would be Penova or Penovska.
The name Popov is from (Popo, an Eastern Orthodox Priest) Your ancestor was probably a Priest in Dolno Kotori.
Dolno Kotori is an interesting village and not far from where my Grandparents were born. If I can help you with more information please feel free to write me: firstname.lastname@example.org
Good Luck, Marvin