Verity comes from the Latin veritas, meaning "truth." English Puritans adopted Verity as a virtue name in the 17th century alongside Faith and Hope.
Verity is widely used in the UK and rising elsewhere.
Verity 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 Verity reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.