After I replied I did a quick online check:
You are "Venetian" (The name is)
In Greece, most of your relatives call themselves Chiampas and some of them are married around Sparta/Kalamata. There is a minority calling themeselves Tsiambas (The Greek language does not intertain the letters "mb" as "B" is either "V" or "MP"
In Italy, your relatives call themselves Ciampas. I suspect that in USA also the name Kiampas must exist. AND maybe Hiampas.
Unfortunately, my computer broke down and I can not access my data base.