Oakleigh is the modern American feminine spelling of Oakley — from the Old English āc-lēah (oak meadow, clearing among oaks). A top-1000 US baby name since 2015. Oakleigh, Australia — suburb of Melbourne. Oakleigh Greene — American model. The oak tree itself has been a symbol of strength and longevity in Celtic, Germanic, and Greek tradition since antiquity.
Oakleigh 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 Oakleigh reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.