In Croatia, Modrčin families are Croats (from Kraljevica ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and in Kraljevica area.
Prevalence
About 30 people with faimily name Modrčin live in Croatia today, in 16 households. There were 10 of them in the middle of the past century, and their number tripled. They are located in threee Croatian counties, in 6 cities and threee other places, mostly in Smrika (10), Kraljevica (<10), Rijeka (<10), Hreljin (<5), and in Banovina in Kraljevica area (<5).
Outside Croatia
At least one family with this surname emigrated from Croatia to the United States. Family name Modrčin (including: Modrcin , Modercin ) is present in 6 countries on three continents. The family name "Modrcin " is used by some 100 people in the United States and small number in Canada.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.