Aubrey comes from the Norman French Aubri, from the Old Germanic Alberic — composed of alf (elf) and ric (ruler) — meaning "elf ruler" or "wise counsel from elves." In medieval European folklore, Alberic was a king of the dwarves; the name carried mythic weight in early Norman France.
Aubrey was originally a male name and remained so until the late 20th century. is recent and complete: today over 95% of Aubreys born are girls. It sits in the U.S. top 75.
Aubrey 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 Aubrey reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.