Julia is the feminine of Julius — the Roman family name to which Julius Caesar belonged. The root iulus means "downy-bearded" or "youthful," and the Julian family claimed descent from Iulus, son of Aeneas and grandson of Venus.
Julia has been continuously in the U.S. top 200 for over 140 years. The actress Julia Roberts and the chef Julia Child are among the most iconic American Julias. Today the name sits in the U.S. top 100.
Julia 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 Julia reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.