Reva (रेवा) is the Sanskrit name for the Narmada River — one of the seven sacred rivers of Hinduism. The word means "swift" or "flowing." The Narmada is personified as the goddess Reva.
Reva is widely used in India.
Reva 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 Reva reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.