It's funny that you mention this; back in build v0.3, you could access a special 'dev room' with messages from the devs and a prototype version of the clothes selector for Asterion called Build-a-Moo if you named yourself Anon. The old man will have a small reaction to your unusual name (which actually still persists in this build), but the room is no longer accessible. As far as I know, that's the only Easter egg out there for the PC's name.
While we're on the subject though, I should mention that Chapter 15 also has a spot where you type in a name to someone's phone, and they do have various reactions based on what you put. I'm not sure I'd call them Easter eggs to be honest, as they're less about meta things and more focused on what the character might actually respond with if you put that name in their phone, but some have bigger reactions and responses than others.