Annabelle is a compound name combining Anna (Hebrew Hannah, "grace") with the Latin bella ("beautiful") — giving "gracious beauty." It originated in medieval Scotland as Anabel.
Annabelle has been rising rapidly in the U.S., currently sitting in the top 70.
Annabelle 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 Annabelle reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.