Brigitte is the French and German form of Bridget, which descends from the Irish Brigid — the name of a powerful Celtic goddess and of Ireland's beloved Saint Brigid. Its meaning is the exalted one, or strength.
Brigitte 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 Brigitte reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.