Nanna is from the Old Norse nanna (woman, mother). Nanna was the Norse goddess and wife of the beautiful god Baldr — when Baldr was killed by Loki's trick and laid on the funeral pyre, Nanna died of grief and was burned alongside him. The original "died of a broken heart."
Featured in the Prose Edda.
Nanna 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 Nanna reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.