WP page title from template

    function fellepo_title_filter( $title ) {
      global $fellepo_name;
      global $post;
      if (get_page_template_slug( $post->ID ) == basename(__FILE__)) {
        return $fellepo_name;
      } else {
        return $title;
      }
    }
    add_filter( 'the_title', 'fellepo_title_filter', 100 );