Aliénor is the Old French/Provençal original of Eleanor — possibly from Occitan alia (other) and meaning "other Aenor" (after her mother). Aliénor d'Aquitaine (1122-1204) was the Duchess of Aquitaine, Queen of France then Queen of England — mother of Richard the Lionheart and King John, the most powerful woman of the medieval period.
Aliénor is widely used in modern France.
Aliénor 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 Aliénor reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.