Hoku means star — bright, guiding, high above. In Hawaiian voyaging, stars were the wayfinders map, and the name carries that light.
Hoku 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 Hoku reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.