In Croatia, Iršić families are Croats (from Samobor ).
Prevalence
About 10 people with faimily name Iršić live in Croatia today, in one household only. They are located in one Croatian city only, in Samobor (<5).
Outside Croatia
Family name Iršić (including: Irsic , Irschick ) is present in 11 countries worldwide. "Irschick " is used by some 90 people in Argentina , small number in Canada , and small number of people in the United States.