In the Bible, Beulah is a place, not a person, applied to the land of Israel by the prophet Isaiah. The land of Beulah has sometimes been considered a reference to heaven. Beulah began to be used as a given name in England at the time of the Reformation and was used by the seventeenth century Puritans.
The Beulah Show ran on the radio in the 1940s and became a television sitcom in the 1950s, the first to feature an African-American title character. But that accomplishment is undercut by the fact that Beulah is a somewhat stereotypical maid.
Only 14 baby girls were named Beulah in the US in 2015. So yes, the name Beulah would challenge the most audacious baby namer--but maybe that audacious baby namer is you.