In Croatia, Frei families are Croats (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Osijek and Sisak.
Prevalence
About 10 people with faimily name Frei live in Croatia today, in 6 households. There were 10 of them in the middle of the past century, and their number remains constant. They are located and another small Croatian place , mostly in Staro Pracno (<5), Tenja (<5), Zagreb (<5), Varazdin (<5), and in Sisak (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.