Tarpeia was the Roman vestal virgin who, in the legend of the Sabine War, betrayed Rome to the Sabines in exchange for what they wore on their arms — expecting gold bracelets, she received their shields, which crushed her to death. The Tarpeian Rock, from which traitors were thrown, was named after her.
Featured in Livy and Plutarch.
Tarpeia 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 Tarpeia reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.