Pearl is the English word for the gem formed inside oysters — from the Latin perla.
Pearl peaked in the U.S. The author Pearl S. Buck (1892-1973) won the Nobel Prize in Literature; Janis Joplin's posthumous album was titled Pearl.
Pearl 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 Pearl reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.