Chiara is the Italian feminine of Clare — from the Latin clarus, meaning "bright," "clear," or "famous." Saint Chiara (Clare) of Assisi (1194-1253) was the founder of the Order of Poor Ladies (the Poor Clares), the female counterpart to the Franciscans.
Chiara is one of the most popular girl names in Italy. Outside Italy it is used by families with Italian heritage.
Chiara 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 Chiara reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.