It depends on which Greek god. I will tell you all their names just in case you need them.
Answer: Janus's Name in Greek mythology is Ianus. Many of the Roman gods were actually Greek before the Romans conquered them and incorporated their gods into the Roman religion.
It depends on which Greek/Roman god/goddess.
His Roman name was Mars.
Well the Greek messenger of the Gods is Hermes, but the Roman name is Mercury.
The greek king of gods is named Zeus, but in Roman his name is Jupiter.
The greek and roman god of sun is Apollo for both greek and roman
The Roman gods are basically the same, but changed in name, and made to be more warlike and violent.
Greek-Hades Roman-Pluto
anemoi
Troy
Hermes was the Greek messenger god. His Roman name was Mercury.
Apollo. He was one of the few gods with the same name in Greek and Roman.