In Croatia, Wirth families are Croats (from Nova Gradiska ). In the past century, relatively most of Croatian residents bearing this family name were born in Nova Gradiska and Pakrac.
Prevalence
About 10 people with faimily name Wirth live in Croatia today, in 7 households. There were 20 of them in the middle of the past century, and their number halved. They are located in three Croatian cities only: in Nova Gradiska (<10), Sesvete (<5), and in Zadar (<5).