Iulia is from the Romanian Iulia — Romanian rendition of Latin Julia — feminine of Julius (Roman gens name, possibly youthful). Iulia is one of the Romanian feminine names — central to traditional Romanian Orthodox heritage.
Iulia 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 Iulia reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.