I wonder if anyone from this thread is still active...but I'm an Ihasz, not sure how helpful I will be: born, Dec 6 1985. And live in Long Island, NY.
My father is James, and we recently had a conversation where he mentioned he had researched his little known father (my grandfather), whose named turned out to be Joseph (Jozef?). That conversation is what prompted me to try and learn more about my last name/ancestry.
I'll leave it there until someone else replies...I wonder how many relatives I have out there with this crazy last name :)