Thank you for responding. I was originally researching the family name in Gottschee, a Germanic area of Austria, which is now Slovenia. The church death records of Nikolaus Milovic the second gave his birthplace as Köln, Germany, on October 1850. So I looked at the films of the state birth records for Köln, Germany in 1850 and found his birth and his parents' names. The father was Nicholaus Millowitsch, age 25, stonecarver. So I thought the son had emigrated from Germany, and that's where the family had originally been from.
By the way, my family has spelled it the German way as Millovitsch since my grandfather arrived in America from Gottschee.