Rosalba combines the Latin rosa (rose) and alba (white) — "white rose."
Rosalba Carriera (1673-1757) was the iconic Venetian Rococo pastel portraitist — perhaps the most famous female painter of her era.
Rosalba 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 Rosalba reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.