Wailani is from the Hawaiian wai (water) + lani (heaven, sky) — heavenly water. Wailani is one of the Hawaiian feminine compound names — central to traditional Hawaiian celestial-aquatic naming alongside Kaimana (ocean power), Keilani (heavenly glory), and Leilani (heavenly flowers).
Wailani 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 Wailani reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.