A unisex name in Spanish-speaking countries, predominantly feminine. Rosario Miraggio — Italian singer. Rosario is also a major city in Argentina (birthplace of Che Guevara and Lionel Messi).
Rosario 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 Rosario reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.