Tahiana is from the Malagasy Tahiana — blessed, beloved. Tahiana is one of the Malagasy feminine names — central to traditional Madagascan Austronesian-Bantu Indigenous heritage.
Tahiana 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 Tahiana reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.