Lavinia comes from the Latin Lavinium — the ancient city in Lazio founded by Aeneas after his arrival in Italy. In Virgil's Aeneid, Lavinia is Aeneas's wife and the mother of the Roman people.
Lavinia peaked at #432 in the U.S. in 1880. Today it is returning slowly as part of the broader vintage Latin revival.
Lavinia 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 Lavinia reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.