Nooshin is from the Persian نوشین (Nūshīn — sweet, pleasant, agreeable) — from Persian nūsh (sweet drink/nectar). Nooshin is one of the Persian feminine names — central to traditional Persian poetic heritage.
Nooshin 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 Nooshin reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.