Ključar families are Croats and they are mostly from Sveti Ivan Zelina. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Sveti Ivan Zelina.
Prevalence
About 110 people with faimily name Ključar live in Croatia today, in 40 households. There were 130 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 8 Croatian counties, in 8 cities and 17 other places, mostly in Zagreb (25), Gornje Oresje (15), Veliki Grdjevac in Grubisno Polje area (<10), Sveti Ivan Zelina (<10), and in Vinicno in Novi Marof area (<10).
Outside Croatia
Family name Ključar (including: Kljucar , Klyuchar ) is present in 7 countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.