Warrah is from the Aboriginal Australian (likely Yindjibarndi / Pilbara language) warrah — white cockatoo, sulfur-crested cockatoo. Warrah is one of the Aboriginal Australian feminine + nature names — central to traditional Australian Indigenous bird-naming heritage.
Warrah 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 Warrah reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.