Creusa (Κρέουσα) is the Greek word for "princess" or "queen." Multiple Greek-Roman princesses bore the name — most notably Aeneas's Trojan first wife, who was lost during the fall of Troy and appeared to him as a ghost predicting his Italian destiny.
Featured in Virgil's Aeneid Book II.
Creusa 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 Creusa reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.