Vaishali is from the Sanskrit वैशाली (Vaiśālī — spacious, prosperous). Vaishali is one of the Sanskrit feminine names — central to traditional Hindu + Buddhist + Jain heritage.
Vaishali 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 Vaishali reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.