Who is Felix in mythology?

I have only found a few references to Felix ("lucky") in
Greek or Latin mythology. According to one source, Mount
Felix was where the gods would go in order to restore their virility.
There are several references to Venus Felix.
Venus Felix is a sculpture that pictures the Goddess Venus with her
son, Cupid. It is located at the Museo Pio-Clementino of the Vatican Museums, Rome, and
is displayed in the Octagon of the Hermes Hall. The term "Venus Felix" ("Lucky Venus")
was also used as an epithet for two different temples--one that was located on Esquiline
Hill, and another designed by the Emperor Hadrian on the Via Sacra. Its dedication read
"Venus Felix et Roma Aeterna" ("Favorable (or Lucky) Venus and
Eternal Rome").