Ah yes, another beer brewed by the Czechs, among
the master beer brewers of Europe. The breweries in Pilsen and Budweis are better known (the Anheuser-Busch product must be marketed under the name "Bud" in all but four countries of the European Union in deference to the Czech original, which probably inspired German-born Adolphus Busch to produce his "Bohemian-style" lager after a vacation there). Interestingly, the brewery is quite young, founded in 1970, but the name is derived from a Slavic
god. I don't recall how familiar JRRT was with Slavic mythology, at least compared to the Germanic, Celtic, Classical and Finnish mythologies, but a one-letter difference sure can "fuel" speculation.