There are two ways to change the player's name:

1. After purchasing the “Commander Name Change” item from the store, it will be directly added to your Backpack. Click on the item from your Backpack, then choose to use it, and change the commander's name.
Note: The Commander's name is the Base name.

2. Click on the avatar, then on the pen beside the commander name, and pick the name you want. If you don't have the "Commander Name Change" item, you can still change your name using 200 gold.
Note: After the tutorial, new players can change the commander's name once for free.