The name Cindy ranked 264th in popularity for females of all ages in a sample of 2000-2003 Social Security Administration statistics and 113th in popularity for females of all ages in a sample of the 1990 US Census.
This name makes a strong showing in state popularity data of the 1960s, but makes few (if any) appearances on lists compiled after that period.
The meaning of the Greek mountain's name has been lost. Kynthia (which developed into the English Cynthia) was a ritual description of Artemis, the ancient Greek goddess of the moon, who was said to frequent the spot.
While Cindy's primary source is certainly Cynthia, it also developed as a nickname for Lucinda and Cinderella.