Ember Checkbox getting name of element in callback

If I define a checkbox as follows:

  {{input type="checkbox" name="email" checked=controller.isEmailChecked}} Email

In the callback controller.isEmailedChecked, defined as:

isEmailChecked: function(key, value) {
 ...
}

How do I get the value of name ("email")?

My controller is responsible for displaying multiple checkboxes so I do not want to have to write lines like this:

  {{input type="checkbox" name="x" checked=controller.isXChecked}} X
  {{input type="checkbox" name="y" checked=controller.isYChecked}} Y

Only to be doing:

ixXChecked: function(key, value) {
  // Set or Get
  this.set('x', value);
  this.get('x');
}
ixYChecked: function(key, value) {
  // Set or Get
  this.set('y', value);
  this.get('y');
}

Can someone point me to the docs please.

Edit: Same applies to actions on Buttons:

        <button {{action 'toggleSetting'}}>
        </button>

How would I get the name of the element in the toggleSetting callback?

Thanks a lot,