Tončinić families are Croats and they are mostly from Buzet area. In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and in Buzet area. In Boljun in Buzet area every fifth inhabitant had the family name Tončinić.
Prevalence
About 120 people with faimily name Tončinić live in Croatia today, in 50 households. There were 80 of them in the middle of the past century, and their number increased by 70 percent. They are located in 6 Croatian counties, in 11 cities and 10 other places, mostly in Rijeka (50), Pula (<10), Pazin (<10), Boljun in Buzet area (<10), and in Samobor (<10).
Outside Croatia
Family name Tončinić (including: Toncinic , Toncinich ) is present in three countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.