Canon EOS 80D - Manual (Page 257)

W-9
Registering a Nickname
3
Enter a nickname.
 For instructions on entering
characters, see the next page.
 Enter any characters between 1 to 10
characters in length.
4
Exit the setting.
 When you are finished, press the
<M> button.
 Select [OK] on the confirmation
dialog and press <0> to return to
the menu screen.
Since the nickname is mandatory information, you cannot delete all the
characters.
By default, the camera name will be displayed for the nickname.