What is C2's actual name? What is the actual name of character c2 in the anime code geass? I would also like to know the name of v2 if that is possible.
Answered here.

It is unknown by design. C2's name is obscured when she tells it to Lelouch in the cave (first sesason, episode 5 to 8 -ish).

Nowhere it is written, and given the producers inclination to secrecy, it won't be revealed.

It is speculated that the name begins with the letter C, but that is all.