In Croatia, Svast families are Croats (from Senj ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Rijeka.
Prevalence
About 10 people with faimily name Svast live in Croatia today, in 7 households. There were 30 of them in the middle of the past century, and their number decreased significantly. They are located and another small Croatian place , mostly in Senj (<10), Rijeka (<5), Zagreb (<5), Senj (<5), and in Pula (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.