Niloo is from the Persian نیلو (Nīlū) — diminutive of Niloofar (نیلوفر — lotus, water lily) — from Sanskrit nīlotpala (blue lotus). Niloo is one of the Persian feminine diminutive names — central to traditional Persian floral-aesthetic heritage. The Persian niloofar (lotus) is central to Persian + Sufi poetry symbolism Zoroastrian sacred floral tradition.
Niloo 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 Niloo reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.