Fulla ("abundance, fullness") is the Old Norse goddess and handmaiden of Frigg — she keeps Frigg's golden casket and footwear, and is the keeper of her queen's secrets. Snorri mentions her among the twelve Æsynjur (goddesses).
Used as a feminine name in modern Scandinavia.
Fulla 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 Fulla reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.