Junia comes from the Roman family name Junius — derived from the goddess Juno, queen of the gods and protector of women. In the New Testament, Junia is named by Paul as "outstanding among the apostles" (Romans 16:7) — likely the first named female apostle.
Junia is rising slowly as a girl's name.
Junia 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 Junia reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.