Taiga is from the Japanese taiga (大河 — great river) — also coinciding with the English tiger. Taiga Aisaka is the female protagonist of the iconic light novel series Toradora!
Taiga 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 Taiga reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.