Claudia Severa (c. 70-c. 130 CE) was the wife of Aelius Brocchus, commander of a Roman fort near Vindolanda on Hadrian's Wall. Her birthday party invitation to her friend Sulpicia Lepidina ("darling soul"), written on a wooden tablet around 100 CE, is the earliest surviving handwritten document by a woman in Latin — possibly even her own handwriting at the end ("farewell, sister, my dearest soul").
Discovered at Vindolanda; now at the British Museum.
Claudia Severa 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 Claudia Severa reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.