Hi my name is John Jaso (i live in Australia)and replying to the person who said the heritage is European two schools of thought about the name because of immigration from the former Chechoslovakia in the 1770`s immigrated to Serbia in 1770`s becuase of religious intollerance also some people scholars say the name also have come from Argon region southern france/northern Spain which meant a lot of spanish speaking Jaso`s also in south America ?

regards john Jaso

P.S to the person who said their family came from Europe we had family members imigrate to the U.S.A (Chicago/New York ?)was your family member called Simon/Joseph ? may be came a place called Stara Pazova near Belgrade they left for the U.S in the 1920-1930`s ?