In Croatia, Krelja families are generally Croats (from Pula area ), barely Slovenes (from Pula ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Pula and in Pula area.
Prevalence
About 60 people with faimily name Krelja live in Croatia today, in 30 households. There were 20 of them in the middle of the past century, and their number tripled. They are located in threee Croatian counties and 6 other places, mostly in Pula (20), Rovinj (<10), Krnica in Pula area (<10), Hrboki in Labin area (<10), and in Zagreb (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.