Fairuz is from the Arabic فيروز (Fayrūz — turquoise, turquoise gemstone) — from Persian pīrūz (victorious). Fairuz is one of the Arabic feminine names — central to traditional Lebanese + Arab heritage. Arabic feminine name reflecting Lebanese musical heritage.
Fairuz 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 Fairuz reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.