Xanthippe is from the Greek Xanthíppē (Ξανθίππη) — xanthos (yellow, blond) + hippos (horse) — yellow horse. Xanthippe (c. 5th-4th c. BCE) was the wife of Socrates and mother of his three sons (Lamprocles, Sophroniscus, Menexenus). Appears throughout Plato's Phaedo (where she attends Socrates's death scene) and Xenophon's Symposium and Memorabilia.
Xanthippe 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 Xanthippe reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.