You’re correct. To quote Christian himself, “ Reddit is kinda space themed -> app helps you explore Reddit -> spaceships help you explore space -> thus app is a spaceship -> Apollo is a cool spaceship name

I like the God of Knowledge answer too”

Artemis is the double-whammy as in Greek mythology she is the sister to Apollo, and the Artemis program is also the successor to the Apollo program; bringing human space exploration back to the moon.

Similarly Soyuz was the Soviet equivalent to the Apollo program, though I understand that might come with some unwanted political baggage.

Orion is also a Greek deity, and the Orion spacecraft is used in the current Artemis program.

Helios and Phoebus are other Greek equivalents of Apollo. (Other possibilities could be Ra, Utu(g), Amun, Mithra, etc.)

I also saw someone mention LEM (for lunar excursion module) which I think is genius, if not a bit confusing with lemmy, especially for folks new to the whole federated internet thing