Sorry I can't help but if you don't have any response here, you may want to post on http://forums.delphiforums.com/iarelative
It has members that are very helpful in Bohemia research.
I was quite surprised to see a ship manifest from that time actually listing specific villages/towns of origin, and in clear handwriting, too. I looked at the other manifest pages of the Capella but didn't see any other "Okrouhli", Bohemia listings. Sometimes a different spelling can be found that clarifies such a mystery, but not in this instance.
EDIT/UPDATE: LOL, had I waited just a few minutes, my reply would not have been necessary! "labald" presented quite a thorough reply while I was typing.