Cognomen Петра (Petra 
, Петра 
, Petrà) , all over the world, is a widespread last name. The family name Петра is habitual in Bulgaria, where it is a common surname, Mexico, and Venezuela, where it is quite a common surname (explore the name in all countries). In absolute terms, it most frequently occurs in Mexico, Spain, and Bulgaria. More prevalently, Петра is the forename as well as the last name.