Haylee is a modern American spelling variant of Hailey/Haley — from the Old English hēg-lēah ("hay clearing, meadow"). A top-500 US baby name since 2003. Haylee Wanner — American competitive cheerleader. Haylee Cooney — American gymnast. Halie Loren — American jazz singer (slightly different). Haylee Linsley — American beauty pageant winner. Haylee Sanders — American football kicker. The spelling Haylee is more popular than Hailee in some US states (notably Texas, Tennessee, and Florida) and reflects the broader Southern-US American preference for double-e endings (Madilee, Hayleigh, Bailee).
Haylee 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 Haylee reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.