You can only change the name on your Gmail account on a desktop browser. You can’t use the Gmail mobile app on Android, iPhone, or iPad to change your name.
How-To Geek

Learn How to Change Your Display Name on Gmail @ How-To Geek
You can only change the name on your Gmail account on a desktop browser. You can’t use the Gmail mobile app on Android, iPhone, or iPad to change your name.
How-To Geek
Learn How to Change Your Display Name on Gmail @ How-To Geek