In Croatia, Runco families are predominantly Italians (from Pula area ), rarely Croats (also from Pula area ). In the past century, relatively most of Croatian residents bearing this family name were born in Pula.
Prevalence
About 10 people with faimily name Runco live in Croatia today, in four households only. There were 40 of them in the middle of the past century, and their number decreased significantly. They are located in only two Croatian places: in Pula (<10) and Pomer in Pula area (<5).
Outside Croatia
Family name Runco is present in 21 countries worldwide. The family name "Runco " is used by some 800 people in the United States , about 400 in Argentina , and some 300 people in Italy. "Runzo " is used by some 100 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.