The Nintendo video game series The Legend of Zelda (1986 onward), in which the princess Zelda is a recurring central figure, gave it a second life. Today Zelda sits in the U.S. top 600 and is rising fast.
Zelda 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 Zelda reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.