Brittany is from the French Bretagne — the northwestern French Celtic region settled by Britons fleeing Anglo-Saxon Britain in the 5th-6th centuries. Baby One More Time (1998).
Brittany 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 Brittany reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.