Hailey comes from an English surname meaning "hay meadow" — from the Old English hēg (hay) and lēah (clearing, meadow).
Hailey rose dramatically in the U.S. Today it sits in the U.S. top 100. The actress Hailey Bieber (née Baldwin) is among the most prominent contemporary Haileys.
Hailey 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 Hailey reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.