Sanni is a Finnish pet form of Susanna, from the Hebrew for lily. It is bright, friendly and warm.
Sanni 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 Sanni reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.