Fiorenza is from the Latin/Italian Florentia (flourishing, blooming) — referring to the iconic city of Florence (Firenze). Fiorenza Carbonai — Italian author. Fiorenza Rosati — Italian biographer. Princess Fiorenza — Italian heritage naming.
Fiorenza 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 Fiorenza reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.