Boudicca (from the Proto-Celtic boudi, "victory") was the Iceni queen of eastern Britain who led the largest indigenous revolt against the Roman Empire (60-61 CE). Her revolt was the closest the Britons ever came to expelling Rome.
Boudicca 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 Boudicca reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.