In Croatia, Grubar families are generally Croats (from Petrinja ), very rarely Slovenes (from Slovenia ). In the past century, relatively most of Croatian residents bearing this family name were born in Petrinja and Sisak.
Prevalence
About 20 people with faimily name Grubar live in Croatia today, in 12 households. There were 60 of them in the middle of the past century, and their number decreased significantly. They are only located in in 6 Croatian cities and another small place , mostly in Petrinja (<10), Nebojan (<10), Split (<5), Greda (<5), and in Zadar (<5).
Outside Croatia
Family name Grubar is present in 9 countries on two continents. The family name "Grubar " is used by some 100 people in the United States , small number in Ukraine , and small number of people in Italy.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1925 in source Emigration Commission Zagreb.