990-c. 1057) was the daughter of King Sveyn Forkbeard of Denmark and sister of Cnut the Great — mother of King Sveyn II, founder of the Danish royal dynasty that ruled into the modern era.
Buried at Roskilde Cathedral.
Estrid 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 Estrid reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.