In Croatia, Klas families are Croats (from Lepoglava ). In the past century, relatively most of Croatian residents bearing this family name were born in Cazma area and in Zagreb. In Žabnica in Cazma area every twentieth inhabitant had the family name Klas.
Prevalence
About 20 people with faimily name Klas live in Croatia today, in 8 households. There were 30 of them in the middle of the past century, and their number decreased by 30 percent. They are only located in in 6 Croatian cities and two other places, mostly in Lepoglava (<10), Zagreb (<10), Krizevci (<5), Slemenice (<5), and in Varazdin (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.