The Bukowatz surname is most likely Bukovec. Bukovac sounds more Croatian to me. However, there are at least two Vimolj in Slovenia, one near Ljubljana the other near Stari Trg ob Kolpi. There is no Bukovec/Bukovac in any Vimolj today according to the telephone directory. However, there are four Bukovec near Kocevje, one in the Stari Trg ob Kolpi area. There are also two Bukovac in the Kocevje area. There are Bukovec in various parts of Slovenia, and Bukovac in the Ljubljana area as well.