Connie is the English diminutive of Constance — from the Latin constantia (steadfastness).
Subject of Chung's memoir Connie (2024).
Connie 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 Connie reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.