My mother's family name is Popovich. They are from the Balkans. Area, where my mother's family comes from is known as Lika (presently region of Croatia, in early 1900 under Austrian-Hungarian Empire).
A lot of people left that area heading to the USA, so did part of my family in late 1890.
As Austrians lost World War one in 1908, Kingdom of Yugoslavia was formed, at that time known as Kingdom of Serbs, Croats and Slovenes. Majority of Popovich families were then spread arround the Kingdom of Yugoslavia and some in Kingdom of Monte Negro.
Good luck...and name Popovich in Yugoslavian means Clergyman's family.