I haven't been able to reproduce this.
I don't think it's related to the names, but it could be related to something that you've assigned somewhere.
Here is how I tested the names. I tested with two entities in the Demo scene: the Knight and the Orcs.
In the scene I changed the Knight's Quest Giver > ID to "Sir Goodwin". His EntityType asset is named "Knight", and the EntityType's Display Name is "Good Knight".
In the scene, I changed the orcs' GameObject names to "Ork" with a 'k'. Their EntityType asset is named "Orc", and the EntityType's Display Name is "an Orc".
If you look at the Knight and Orcs in the original Demo scene, can you tell me how your setup is different?