Donatella is the Italian diminutive of Donata — from the Latin donatus, meaning "given" (by God). Used widely in Italy.
Donatella Versace (born 1955), the Italian fashion designer, is the most internationally known bearer.
Donatella 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 Donatella reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.