diff --git a/app/code/Magento/Quote/Model/QuoteManagement.php b/app/code/Magento/Quote/Model/QuoteManagement.php
index b71cee9845134..e4ee95b80228f 100644
--- a/app/code/Magento/Quote/Model/QuoteManagement.php
+++ b/app/code/Magento/Quote/Model/QuoteManagement.php
@@ -159,7 +159,7 @@ class QuoteManagement implements \Magento\Quote\Api\CartManagementInterface
      * @param \Magento\Quote\Api\CartRepositoryInterface $quoteRepository
      * @param \Magento\Customer\Api\CustomerRepositoryInterface $customerRepository
      * @param \Magento\Customer\Model\CustomerFactory $customerModelFactory
-     * @param \Magento\Quote\Model\Quote\AddressFactory $quoteAddressFactory,
+     * @param \Magento\Quote\Model\Quote\AddressFactory $quoteAddressFactory
      * @param \Magento\Framework\Api\DataObjectHelper $dataObjectHelper
      * @param StoreManagerInterface $storeManager
      * @param \Magento\Checkout\Model\Session $checkoutSession
@@ -221,7 +221,7 @@ public function __construct(
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function createEmptyCart()
     {
@@ -241,7 +241,7 @@ public function createEmptyCart()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function createEmptyCartForCustomer($customerId)
     {
@@ -257,7 +257,7 @@ public function createEmptyCartForCustomer($customerId)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function assignCustomer($cartId, $customerId, $storeId)
     {
@@ -332,7 +332,7 @@ protected function createCustomerCart($customerId, $storeId)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function placeOrder($cartId, PaymentInterface $paymentMethod = null)
     {
@@ -354,11 +354,12 @@ public function placeOrder($cartId, PaymentInterface $paymentMethod = null)
         if ($quote->getCheckoutMethod() === self::METHOD_GUEST) {
             $quote->setCustomerId(null);
             $quote->setCustomerEmail($quote->getBillingAddress()->getEmail());
-            $quote->setCustomerFirstname($quote->getBillingAddress()->getFirstname());
-            $quote->setCustomerLastname($quote->getBillingAddress()->getLastname());
-
-            if ($quote->getBillingAddress()->getMiddlename()) {
-                $quote->setCustomerMiddlename($quote->getBillingAddress()->getMiddlename());
+            if ($quote->getCustomerFirstname() === null && $quote->getCustomerLastname() === null) {
+                $quote->setCustomerFirstname($quote->getBillingAddress()->getFirstname());
+                $quote->setCustomerLastname($quote->getBillingAddress()->getLastname());
+                if ($quote->getBillingAddress()->getMiddlename() === null) {
+                    $quote->setCustomerMiddlename($quote->getBillingAddress()->getMiddlename());
+                }
             }
             $quote->setCustomerIsGuest(true);
             $quote->setCustomerGroupId(\Magento\Customer\Api\Data\GroupInterface::NOT_LOGGED_IN_ID);
@@ -385,7 +386,7 @@ public function placeOrder($cartId, PaymentInterface $paymentMethod = null)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function getCartForCustomer($customerId)
     {
@@ -412,6 +413,8 @@ public function submit(QuoteEntity $quote, $orderData = [])
     }
 
     /**
+     * Resolve items
+     *
      * @param Quote $quote
      * @return array
      */