Queen Cynethryth (d. after 798) was the wife of King Offa of Mercia — the only Anglo-Saxon queen to issue coins in her own name, indicating extraordinary political power. She later became abbess of Cookham.
Featured prominently in Anglo-Saxon historical studies.
Cynethryth 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 Cynethryth reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.