Norse and greek gods do seem to be popular, I’d studied and worked at several places that follow that scheme. There’s a large scope for spelling mistakes though, as the article points out.

Best scheme I’ve used (if you can ignore the silliness) is Pokémon characters. There’s hundreds of them (and guaranteed to be more by the time you run out), the names are all fairly easy to spell and you’ve got pre-made iconography for connection shortcuts :)