In Croatia, Tremac families are Croats (from Ivanic-Grad ). In the past century, relatively most of Croatian residents bearing this family name were born in Ivanic-Grad and in Zagreb.
Prevalence
About 30 people with faimily name Tremac live in Croatia today, in 15 households. There were 40 of them in the middle of the past century, and their number decreased by 10 percent. They are located in four Croatian counties, four cities and 6 other places, mostly in Zagreb (10), Graberje Ivanicko (<10), Bjelovar (<5), Ivanic-Grad (<5), and in Zvekovac in Vrbovec area (<5).
Outside Croatia
Family name Tremac is present in this form only in Croatia.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.