Anitta is the Portuguese diminutive form of Ana — from the Hebrew Channah ("grace"). The name choice was inspired by the Brazilian telenovela character Anita in Presença de Anita (2001).
Anitta 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 Anitta reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.