In Croatia, Terčić families are mainly Croats (from Kastav ), rarely Slovenes (from Opatija ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Opatija and Rijeka.
Prevalence
About 10 people with faimily name Terčić live in Croatia today, in 10 households. There were 20 of them in the middle of the past century, and their number halved. They are located in threee Croatian counties and threee other places, mostly in Opatija (<10), Mucici in Opatija area (<10), Zagreb (<5), Rijeka (<5), and in Kastav (<5).
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.