Marozia (c. 890-c. 937) is from the Italian Maria. Historians call this era "the Pornocracy" — the lurid Latin chronicles say she was Pope Sergius III's mistress at fifteen. Eventually imprisoned by her own son Alberic II.
Marozia 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 Marozia reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.