file pattern name for content type
This is what your looking for.

The Drupal 8 code is the following one.

/**
 * Implements hook_theme_suggestions_HOOK_alter().
 */
function THEMENAME_theme_suggestions_page_alter(array &amp;$suggestions, array $variables) {
  if ($node = \Drupal::routeMatch()-&gt;getParameter('node')) {
    $suggestions[] = 'page__' . $node-&gt;getType();
  }
  return $suggestions;
}