I came across this website when i was looking for information on my ancestors. My surname is Hrestak and i live in Australia. My father is Croatian and his family came from Zagreb/Slovonia in Croatia.
My uncle told me a few years ago he received a letter about our ancestors and apparent links to Austria through Archduke Franz Ferdinand. It also said we had lots of family that moved to the U.S.
To my knowledge, my family were the only Hrestaks that came to Australia. Who knows, we could be related :)