In Croatia, Ballmer families are Croats (from Porec ).
Prevalence
Only a few people with faimily name Ballmer live in Croatia today, in one household only. They are located in only one small Croatian place, in Crvar (<5).
Outside Croatia
Family name Ballmer is present in 19 countries worldwide. The family name "Ballmer " is used by some 500 people in the United States , about 200 in Switzerland , and some 60 people in Germany.