Ilmatar is the goddess of the air in Finnish myth, the primordial mother from whom the world was formed in the Kalevala.
Ancient and elemental, her name belongs to the vast open sky.
Ilmatar 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 Ilmatar reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.