Beulah (בְּעוּלָה) is a Hebrew word meaning "married" or "espoused." In Isaiah 62:4, God promises that Israel, formerly called "Forsaken," will be renamed "Beulah" — meaning that the land will be wedded to its God.
Beulah was popular in the late 19th and early 20th centuries. The American actress Beulah Bondi (1888-1981) was a notable bearer. Today the name is rare but rising slowly with the broader return of vintage biblical names.
Beulah does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Beulah reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.