In Croatia, Fleissig families are Croats (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Sisak.
Prevalence
Only a few people with faimily name Fleissig live in Croatia today, in one household only. They are located in two Croatian cities only, in Sisak (<5) and Daruvar (<5).
Outside Croatia
Family name Fleissig is present in 12 countries worldwide. The family name "Fleissig " is used by some 200 people in Germany , about 80 in the United States , and some 80 people in Czech Republic.