You can do that by connecting any social account! Steam works best since it lets you do any name, while Facebook and Apple will filter the name.
No no, I love the random names the game comes up with for my opponents and I wish I could do the same for my character. I don’t want to use my real name. I hope that makes sense.
You can reroll the custom name somewhere in the settings if I remember correctly
But you could of course also just throw together some options in the custom name field
Ah well that's unfortunate, I suppose the only way you can change it is by changing your GameCenter/Apple/Facebook name. Sorry about that.
Pretty sure it works that way so people have trouble setting their names to inappropriate things