Pernille is the Danish-Norwegian form of Petronilla — "rock" (the feminine Peter). Pernille Harder (born 1992) is the Danish football superstar, twice UEFA Women's Player of the Year.
Used widely in Denmark and Norway.
Pernille 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 Pernille reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.