Frankie is the unisex diminutive of Frances or Francis — from the Late Latin Franciscus, meaning "Frenchman" or "free one."
Frankie has been rising as a girls' name since 2014. Today Frankie sits in the U.S. top 500.
Frankie 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 Frankie reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.