If you are a user of the mail service enter in your email and in the top menu of the page, find the panel "More". Open it and from the list select "Personal data". In the window that opens, adjust all of the desired data. With new information, hit "Save". If you want to change the username on the page "My world" sign in the upper left corner you will find the list of options, and change information.
To change the name of a mail box of Gmail.EN click on "Settings" located at the top right of the page. Next, click on the tab "Accounts and import" and click "Edit". In the dialog box "Change email address" enter your name and click "Save changes". Check that in the tab "Accounts and import" new login changed.
To change the name on go to "Settings" and click on "Passport." In the opened window "Personal data" click on the link "Change personal data". Keep your new login and hit "Save". Restart Inbox.
Go to your email Inbox, locate and click on menu "Profile". You will see a window for the introduction of new data, where you can change not only the alias but also other information such as last name or name.
If you are a user of the email address from the mail server to change the nickname you can't. You will need to register another box.
If you change the name of the electronic box think that in the future it had to change again. Possibly it should be beautiful and easy to remember. Not to forget your username and password from the email, save the data in a place not accessible to third parties.