Immacolata is from the Italian Immacolata — from the Latin immaculātus (without stain, immaculate). Immacolata is one of the Italian Marian-devotion names — referring to the Catholic dogma of the Immaculate Conception (defined by Pope Pius IX in Ineffabilis Deus, 1854) — the doctrine that the Virgin Mary was conceived without original sin. The Feast of the Immaculate Conception (December 8) is one of the Marian feast days in the Catholic calendar. The iconic Spanish Inmaculada paintings by Bartolomé Esteban Murillo (17th c.) are masterpieces of Spanish Baroque art.
Immacolata 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.
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In Pythagorean numerology the letters of Immacolata reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.