Index: src/wp-includes/class-wp-editor.php
===================================================================
--- src/wp-includes/class-wp-editor.php	(revision 38937)
+++ src/wp-includes/class-wp-editor.php	(working copy)
@@ -839,6 +839,7 @@
 			'Formats' => _x( 'Formats', 'TinyMCE' ),
 
 			'Headings' => _x( 'Headings', 'TinyMCE' ),
+			'Heading' => _x( 'Heading', 'TinyMCE' ),
 			'Heading 1' => array( __( 'Heading 1' ), 'access1' ),
 			'Heading 2' => array( __( 'Heading 2' ), 'access2' ),
 			'Heading 3' => array( __( 'Heading 3' ), 'access3' ),
Index: src/wp-includes/js/tinymce/plugins/wordpress/plugin.js
===================================================================
--- src/wp-includes/js/tinymce/plugins/wordpress/plugin.js	(revision 38937)
+++ src/wp-includes/js/tinymce/plugins/wordpress/plugin.js	(working copy)
@@ -578,6 +578,12 @@
 					each( listbox.settings.values, function( item ) {
 						if ( item.text && labels.hasOwnProperty( item.text ) ) {
 							item.shortcut = '(' + labels[ item.text ] + ')';
+
+							// Drop the numbers after the labels for headings.
+							// TinyMCE makes previews for the h1-h6. It uses the same styles that are applied in the editor body.
+							if ( item.text.indexOf( 'Heading' ) !== -1 ) {
+								item.text = 'Heading';
+							}
 						}
 					} );
 				}