OK, here's the scoop.
Cindy is indeed short for
Cynthia (Kynthia in Greek). Kynthia means "woman from Kynthos", a mountain on the island of Delos (birthplace of the goddess
Artemis and the god
Apollo).
Kynthia was used as an epithet of
Artemis (
Diana) and Kynthios ("man from Kynthos") was used for
Apollo.
So Kynthia,
Artemis,
Artemisia and
Apollonia are all valid Greek
Cindy counterparts!
To come to Ivayla's point: 'though Kynthia *is* a Greek name, it is quite rarely used nowadays in Greece.
Artemis however is quite popular.
Artemisia and
Apollonia somewhat less frequently encountered :)