Ealdgyth of Mercia (c. 1057-after 1066) was the last Anglo-Saxon Queen of England — wife of King Harold Godwinson, killed at Hastings. She was pregnant with his posthumous son when the Norman Conquest came, fleeing to Chester then disappearing from history.
Distinct from Eadgyth (Edith of Wessex).
Ealdgyth 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 Ealdgyth reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.