Justitia is from the Latin iūstitia (justice) — Roman goddess of justice. Justitia is the Roman goddess of justice, equivalent to Greek Themis and Dike. She is the source of the iconic Lady Justice figure — blindfolded (impartiality), holding scales (weighing evidence), and a sword (executing judgment) — adopted as the universal symbol of Western legal systems.
Justitia 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.
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In Pythagorean numerology the letters of Justitia reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.