Everleigh is from the Old English eofor (wild boar) + lēah (meadow, clearing) — "wild boar meadow.", US top-200 since 2017. Princess Everleigh — modern American heritage naming.
Everleigh 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.
In Pythagorean numerology the letters of Everleigh reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.