There's two pieces to this. Chrome and other browsers will remember previously entered values for field names, and provide an autocomplete list to the user based on that (notably, password type inputs are never remembered in this way, for fairly obvious reasons). You can add autocomplete="off" to prevent this on things like your email field.
However, you then have password fillers. Most browsers have their own built-in implementations and there's also many third-party utilities that provide this functionality. This, you can't stop. This is the user making their own choice to save this information to be automatically filled in later, and is completely outside the scope and sphere of influence of your application.
