Problems with commerce-order-receipt.html.twig

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FYI, once you override the template from the theme, you have to rebuild caches so your override is taken into account.

Also, you can get the first name and last name using the following code:

  /** @var Drupal\commerce_order\Entity\OrderInterface $order */
  $order = $variables['order_entity'];
  if ($billing_profile = $order->getBillingProfile()) {
      /** @var \Drupal\address\AddressInterface $address */
      $address = $billing_profile->get('address')->first();
     // First name.
     $address->getGivenName(),
     // Last name.
     $address->getFamilyName(),
  }