In Croatia, Grdjan families are Croats (from Ivanec ). In the past century, relatively most of Croatian residents bearing this family name were born in Ivanec and Zagreb.
Prevalence
About 30 people with faimily name Grdjan live in Croatia today, in 20 households. There were 40 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 8 Croatian counties, in 9 cities and 12 other places, mostly in Zagreb (10), Varazdin (<10), Sveti Ivan Zabno in Krizevci area (<10), Osecka (<10), and in Sesvete (<5).
Outside Croatia
Family name Grdjan is present in 10 countries on four continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.