Nila (நிலா) is the Tamil word for "moon." In Sanskrit (नीला), it means "blue" or "sapphire-colored" — also an epithet of Krishna and of the river goddess.
Nila is widely used in South India and Sri Lanka.
Nila 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 Nila reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.