Saint Werburgh (c. 650-700) was the Mercian princess and abbess of Ely — patron saint of Chester, where her shrine drew pilgrims throughout the Middle Ages.
Werburgh 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 Werburgh reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.