Amaterasu is the great sun goddess of Japanese myth, the radiant ancestress of the imperial line and one of the supreme kami.
Her name means she who shines in heaven — brilliance itself.
Amaterasu 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 Amaterasu reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.