Add custom theme fonts to the page and post editor using the TinyMCE Advanced plugin
// Add custom Fonts to the Fonts list
add_filter( 'tiny_mce_before_init', 'register_tinymce_fonts' );
function register_tinymce_fonts( $initArray ) {
$initArray['font_formats'] = 'Font Name=Font Name;Font Name=Font Name;';
return $initArray;
}