How can I change my name on Google Play Games? I opened up Google Play Games and clicked my way through it and it has changed my name to 'HighLemon4719'. Previously it was 'crazymaster' with my icon for Google+.  

Every time I start a game on my phone it comes up as the name 'HighLemon4719'. How can I change it as I not like this name?
Open up Play Games and click on your avatar in the header.
Click the Pencil icon in the top right hand corner of the app.
You should then be able to enter a new 'Gamer ID' to replace 'HighLemon4719'. You can also change the avatar image that is displayed too.
Click Save