Justine is the French feminine of Justin — from the Latin iustus (just, righteous). Her one-handed backhand was considered the most beautiful shot in modern women's tennis; she retired suddenly in 2008 at the height of her powers and returned briefly in 2010-2011 before retiring permanently. International Tennis Hall of Fame (2016). Saint Justine of Antioch — 3rd-century martyr.
Subject of countless 2000s tennis retrospectives.
Justine 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 Justine reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.