In your description of the name Ilija, you wrote down that it's only a Macedonian name. Well,that's incorrect. It is also a Serbian name. In fact, it's a very important Serbian name representing a Saint (St. Ilija) who is celebrated in the Serbian Orthodox church on the 4th of August. Also, the Serbian pet form of Petar isn't Pero, but Pera. This is one of the differences between Serbian and Croatian language.