There is a Czech brewery that produces a beer called Budweiser that is imported in the US under the name Czechvar for trademark reasons, but it is in no way related to the Anheuser-Busch product known as "Budweiser". It is much better, in fact.
A-B's Budweiser started as an imitation of Budějovický Budvar*pilsner, imported under the name Czechvar here. It's from the town/city of Budějovice, which in German (?) is Budweis.
http://en.m.wikipedia.org/wiki/Budweiser_Budvar_Brewery