Rosa is the Latin word for "rose" — and the original form from which the English Rose derives. It has been used as a girl's name across the Catholic world for centuries.
Today Rosa sits in the U.S. top 500.
Rosa 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 Rosa reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.