Izanami is a creator goddess of Japanese myth, who with Izanagi shaped the islands and gave birth to many kami.
Her name belongs to the very beginning of the world.
Izanami 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 Izanami reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.