change page name on page list

You can change built in post type labels with the post_type_labels_{$post_type} filter:

function wpd_change_page_labels( $labels ) {
    $labels->menu_name="Specials";
    $labels->name="Specials";
    $labels->singular_name="Special";
    return $labels;
}
add_filter( 'post_type_labels_page', 'wpd_change_page_labels' );

EDIT- Refer to register_post_type for a full list of labels, there are probably some others you’ll want to add to this.