What is the Roman name of epimetheus?

Answer 1

Epimetheus IS the Latin version of the name. In Greek it would be Ἐπιμηθεύς

In all seriousness, though, not all the Greek gods had Estruscan/Roman counterparts, so they simply kept or "Latinized" the Greek names. In this case, since the Greek name fit the naming conventions of Roman names, they simply kept it.

Answer 2

Epimetheus is the Latin version, Επιμηθευς is the Greek.