The name is common among Russians , Ukrainians , Serbs , Bulgarians , Croats , Belarusians , Macedonians , Montenegrins , and to a smaller extent Czechs and Slovaks . The name is common among Russians , Belarusians , Serbs , Ukrainians , Croats , Bulgarians , Macedonians , Montenegrins , and to a smaller extent Czechs and Slovaks .