Charlene is the French feminine of Charles — from the Old Germanic karl (free man). Mother of twins Jacques and Gabriella (born 2014). Charlene Tilton (Dallas TV series). Charlene Wittstock — her name before marriage.
Charlene 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 Charlene reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.