Because the Romans made him a god.
Apollo is the roman god for Apollo his name doesn't change
Apollo was a Greek/Roman god.
Apollo is the name in both Greek and Roman mythology.
Apollo is also Apollon.
Apollon was a Hellenic God and the Romans identified him with one of their Gods, calling him Apollo.
Apollo is the roman god for Apollo his name doesn't change
Apollo is Greek god not Roman.
Apollo was a Greek/Roman god.
There is a Greek and a Roman god named Apollo. There is no planet named after Apollo, unless you know of the Apollo planet that no one knows about yet.
Apollo/Apollon
the sun
Apollo
Apollo.
Apollo is the name in both Greek and Roman mythology.
Apollo is also Apollon.
Aesculapius.
helios in roman