Treasure is from the Old French tresor / Greek thēsauros (a thing stored up, precious wealth) — a modern American word-name in the broader 2000s-2010s aesthetic. A top-1000 US baby name since 2007. The 2010s American naming wave of pure abstract-concept words has been one of the most-studied phenomena in modern US naming registries.
Treasure 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.
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In Pythagorean numerology the letters of Treasure reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.