David,
There are plenty of Czech Kroupa references on the Net, but I couldn't find the meaning. Why not try one of the other Kroupas with listed e-mail addresses:
1) Your namesake at the University of Mississippi, David Kroupa,
at
dlkroupa@olemiss.edu - or -
2) Susan Kroupa, a SF/fantasy writer and librarian in Utah, at
s.kroupa@sff.net
These folks seem savvy (and probably friendly) enough to know and share the meaning of your mutual last name. Why not ask them?
And God bless you too, David. We all need every bit we can get these days.
- Da.