Filipaj families are Croats and they are mostly from Krapina area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Krapina area. In Donje Vino in Krapina area every seventh inhabitant had the family name Filipaj.
Prevalence
About 170 people with faimily name Filipaj live in Croatia today, in 80 households. There were 160 of them in the middle of the past century, and their number increased by 10 percent. They are located in 8 Croatian counties, in 13 cities and 21 other places, mostly in Zagreb (80), in Jurjevec (15) and Donje Vino (10) in Krapina area, Martinisce (<10), and in Vrtnjakovec in Krapina area (<10).
Outside Croatia
Family name Filipaj is present in 7 countries on two continents. The family name "Filipaj " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.