In Croatia, Lach families are Croats (from Koprivnica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Koprivnica area and in Virovitica.
Prevalence
About 50 people with faimily name Lach live in Croatia today, in 20 households. There were 50 of them in the middle of the past century, and their number remains constant. They are located in 9 Croatian counties, in 6 cities and 7 other places, mostly in Virovitica (<10), Spisic Bukovica in Virovitica area (<10), Staro Petrovo Selo in Nova Gradiska area (<10), Gorica in Koprivnica area (<10), and in Dugo Selo (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over forty times, the first time 1691 in source Catholic Church Parish Records.