Charleigh is the modern American feminine spelling of Charlie / Charley — ultimately from Charles, from the Old Germanic karl ("free man"). Charleigh Burns — American competitive cheerleader. Charleigh Edmonson — Australian model. The -leigh feminine ending is broadly considered a Southern US naming tradition; the spelling Charleigh is more popular in Texas, Tennessee, and Florida than in California or New York.
Charleigh 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 Charleigh reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.