I.e Mars- Ares
Venus- Afrodite
Jupiter- Zeus
Mercury- Hermes
Earth- Gaia (hence geography etc.) (Primordial deity)
Neptune- Poseidon
Saturn- Cronos (Titan)
Uranus- (already Greek) Ouranos (Primordial deity)
We even call the sun Helios
Fun fact: In Greece we call planets the names of the Greek gods instead of Roman