570-628) was the Bavarian-born Queen of the Lombards who converted her people to Catholicism — corresponded with Pope Gregory the Great.
Her famous Iron Crown of Lombardy is preserved in Monza.
Theodelinda 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 Theodelinda reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.