Plenča families are Croats and they are mostly from Sibenik. In the past century, relatively most of Croatian residents bearing this family name were born in Sibenik and Zagreb.
Prevalence
About 210 people with faimily name Plenča live in Croatia today, in 70 households. There were 150 of them in the middle of the past century, and their number increased by 40 percent. They are located in 8 Croatian counties, in 9 cities and four other places, mostly in Sibenik (75), Zagreb (25), Vrpolje (25), Rijeka (10), and in Vodice (10).
Outside Croatia
Family name Plenča (including: Plenca , Plencha ) is present in 6 countries on three continents. The family name "Plenca " is used by small number of people in Russian Federation and small number 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.