In Croatia, Kotarščak families are Croats (from Lepoglava area ). In the past century, relatively most of Croatian residents bearing this family name were born in Lepoglava area and in Osijek.
Prevalence
About 20 people with faimily name Kotarščak live in Croatia today, in 10 households. There were 10 of them in the middle of the past century, and their number doubled. They are located and 5 other Croatian places, mostly in Gornja Visnjica (<10), Lepoglava (<10), Bjelovar (<5), and in Jamno (<5) and Purga Bednjanska (<5) in Lepoglava area.
Outside Croatia
Family name Kotarščak is present in two countries on two continents.