To know how to personalize your game name, read on:
You will be assigned a default general name (e.g. General #12345) when you start the game. Once you connect to Facebook, Game Center (iOS), or Google Play (Android), you will be able to personalize your name. To connect to your game to any of these three, tap the Settings (gear) icon, then tap the "CONNECT" button under "Facebook", "Game Center", or "Google Play". Please note that you cannot change your name on your own at this time, so please pick a good one.
In case you have already assigned a name to your game account and you wish to change it, we are offering a one-time courtesy name change. All you need to do is submit a Customer Support ticket by going to Settings > Help, and state your new desired name.