Rannva is from the Faroese Rannvá — Faroese feminine name (Old Norse Ragnhildr-related root). Rannva is one of the Faroese feminine names — central to traditional Faroese Indigenous Scandinavian-Norse heritage of Faroe Islands (Føroyar). Faroese feminine name reflecting Scandinavian Indigenous heritage.
Rannva 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 Rannva reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.