diff --git a/app/code/Magento/ImportExport/Model/Import/Entity/AbstractEntity.php b/app/code/Magento/ImportExport/Model/Import/Entity/AbstractEntity.php
index eb2d56018b31b..87d5f1c1f898a 100644
--- a/app/code/Magento/ImportExport/Model/Import/Entity/AbstractEntity.php
+++ b/app/code/Magento/ImportExport/Model/Import/Entity/AbstractEntity.php
@@ -1,7 +1,7 @@
 <?php
 /**
- * Copyright © Magento, Inc. All rights reserved.
- * See COPYING.txt for license details.
+ * Copyright 2013 Adobe
+ * All Rights Reserved.
  */
 namespace Magento\ImportExport\Model\Import\Entity;
 
@@ -813,7 +813,7 @@ public function validateData()
                     if (!$this->isAttributeParticular($columnName)) {
                         if (trim($columnName ?? '') == '') {
                             $emptyHeaderColumns[] = $columnNumber;
-                        } elseif (!$columnName || !preg_match('/^[a-z][a-z0-9_]*$/', $columnName)) {
+                        } elseif (!$columnName || !preg_match('/^[a-zA-Z][a-z0-9_]*$/', $columnName)) {
                             $invalidColumns[] = $columnName;
                         } elseif ($this->needColumnCheck && !in_array($columnName, $this->getValidColumnNames())) {
                             $invalidAttributes[] = $columnName;
diff --git a/app/code/Magento/ImportExport/Test/Unit/Model/Import/Entity/AbstractTest.php b/app/code/Magento/ImportExport/Test/Unit/Model/Import/Entity/AbstractTest.php
index 9f6c3cbdd0fcc..c169a883ff0a9 100644
--- a/app/code/Magento/ImportExport/Test/Unit/Model/Import/Entity/AbstractTest.php
+++ b/app/code/Magento/ImportExport/Test/Unit/Model/Import/Entity/AbstractTest.php
@@ -1,7 +1,7 @@
 <?php
 /**
- * Copyright © Magento, Inc. All rights reserved.
- * See COPYING.txt for license details.
+ * Copyright 2015 Adobe
+ * All Rights Reserved.
  */
 declare(strict_types=1);
 
@@ -125,6 +125,21 @@ public function testValidateDataColumnNameWithWhitespaces()
             $errorAggregator->getRowsGroupedByErrorCode()
         );
     }
+    
+     /**
+      * Test for method validateData()
+      *
+      * @covers \Magento\ImportExport\Model\Import\Entity\AbstractEntity::validateData
+      */
+    public function testValidateColumnName()
+    {
+        $this->_createSourceAdapterMock(['Test_1']);
+        $errorAggregator = $this->_model->validateData();
+        $this->assertArrayNotHasKey(
+            AbstractEntity::ERROR_CODE_COLUMN_NAME_INVALID,
+            $errorAggregator->getRowsGroupedByErrorCode()
+        );
+    }
 
     /**
      * Test for method validateData()
@@ -133,7 +148,7 @@ public function testValidateDataColumnNameWithWhitespaces()
      */
     public function testValidateDataAttributeNames()
     {
-        $this->_createSourceAdapterMock(['_test1']);
+        $this->_createSourceAdapterMock(['test.1', '@test']);
         $errorAggregator = $this->_model->validateData();
         $this->assertArrayHasKey(
             AbstractEntity::ERROR_CODE_COLUMN_NAME_INVALID,