In Croatia, Kayser families are Croats (from the Island of Krk ). In the past century, relatively most of Croatian residents bearing this family name were born in Cakovec.
Prevalence
Only a few people with faimily name Kayser live in Croatia today, in one household only. There were 0 of them in the middle of the past century, and their number remains constant. They are located in only two Croatian places: in Baska on the Island of Krk (<5) and Sukosan in Zadar area (<5).
Outside Croatia
Family name Kayser (including: Kaysser , Cayser ) is present in 63 countries worldwide. The family name "Kayser " is used by some 20000 people in Germany , about 20000 in Bangladesh , and some 9000 people in the United States.