Naina (नैना) is the Hindi word for "eyes" — from the Sanskrit nayana.
Naina Yadav is a contemporary Indian actress; Naina Lal Kidwai is the Indian banker.
Naina 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 Naina reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.