Rasonja families are Croats and they are mostly from Krapina area. In the past century, relatively most of Croatian residents bearing this family name were born in Krapina area and in Zagreb.
Prevalence
About 90 people with faimily name Rasonja live in Croatia today, in 40 households. There were 120 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 9 Croatian counties, in 11 cities and 9 other places, mostly in Mala Erpenja in Krapina area (30), Zagreb (25), Krapinske Toplice in Krapina area (<10), Pula (<10), and in Cret in Krapina area (<10).
Outside Croatia
Family name Rasonja is present in five countries on three continents. "Rasonya " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.