Hi there, my name is Robert Cvengros and I was just surfing on the web my surname and found this link...I am from Slovakia but living abroad now..What I know that Cvengros surname is originally from Slovakia and most people I know are from east part of Slovakia.
By the way.."Cveng" is a word for "sound" and "gros" was a very old coin used in Slovakia (Austria-Hungary) and even before. So when a coin hits a hard surface it creates that "cveng" sound :-). I don't know whether you know a name " Jozo Niznansky" but it was a famous history writer and he wrought a beautiful book about Alzbeta Bathory..anyway..he mentioned a Cvengros name in that book and it was around the year 1650-ish... So our surname is really really old. If you would be interested, I can provide you some details about Cvengros family, but I am not sure whether we are related or not..There are couple of families in Slovakiawith that surname. Take care Robert