In Croatia, Monjac families are Croats (from Opatija area ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and in Opatija area. In Pobri in Opatija every tenth inhabitant had the family name Monjac.
Prevalence
About 30 people with faimily name Monjac live in Croatia today, in 13 households. There were 40 of them in the middle of the past century, and their number decreased by 20 percent. They are only located in two Croatian cities and 5 other places, mostly in Rijeka (15), and in Matulji (<10), Bregi (<5), Mihotici (<5) and Rukavac (<5) in Opatija area.
Outside Croatia
Family name Monjac (including: Moniac , Monyaz ) is present in 6 countries on three continents.
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.