Rositsa is from the Bulgarian Росица (Rositsa) — rosa (dew, Slavic) + diminutive -itsa — little dewdrop (also folk-etymologized as little rose). Rositsa is one of the Bulgarian feminine names.
Rositsa 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 Rositsa reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.