Clementia is from the Latin clementia (mercy, gentleness). Clementia is the Roman goddess of mercy and clemency — one of the Roman civic virtues. 55-56 CE), addressed to Emperor Nero, are works of Roman Stoic political philosophy. Depicted on Roman imperial coinage.
Clementia 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 Clementia reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.