Graves is from the Old English grafe — a steward or grove-keeper. Percival Graves — character in J.K. (1980). Denise Graves — modern American operatic mezzo-soprano. Graves disease — autoimmune thyroid condition.
Graves 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 Graves reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.