Arnannguaq is from the Greenlandic Kalaallisut arnannguaq — arnaq (woman) + diminutive -nnguaq — little woman, dear little one. Arnannguaq is one of the Greenlandic feminine names — central to traditional Kalaallit Inuit Indigenous heritage.
Arnannguaq 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 Arnannguaq reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.