diff --git a/CHANGELOG.md b/CHANGELOG.md
index 017e31ed..71b131c1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 ### Fixed
 
 - Fully flatten an array [Issue #2955](https://github.com/PHPOffice/PhpSpreadsheet/issues/2955) [PR #2956](https://github.com/PHPOffice/PhpSpreadsheet/pull/2956)
+- cellExists() and getCell() methods should support UTF-8 named cells [Issue #2987](https://github.com/PHPOffice/PhpSpreadsheet/issues/2987) [PR #2988](https://github.com/PHPOffice/PhpSpreadsheet/pull/2988)
 
 ## 1.24.1 - 2022-07-18
 
diff --git a/src/PhpSpreadsheet/Worksheet/Worksheet.php b/src/PhpSpreadsheet/Worksheet/Worksheet.php
index 45111f3c..e89043c8 100644
--- a/src/PhpSpreadsheet/Worksheet/Worksheet.php
+++ b/src/PhpSpreadsheet/Worksheet/Worksheet.php
@@ -1265,7 +1265,7 @@ class Worksheet implements IComparable
             }
         } elseif (
             !preg_match('/^' . Calculation::CALCULATION_REGEXP_CELLREF . '$/i', $coordinate) &&
-            preg_match('/^' . Calculation::CALCULATION_REGEXP_DEFINEDNAME . '$/i', $coordinate)
+            preg_match('/^' . Calculation::CALCULATION_REGEXP_DEFINEDNAME . '$/iu', $coordinate)
         ) {
             // Named range?
             $namedRange = $this->validateNamedRange($coordinate, true);
diff --git a/tests/PhpSpreadsheetTests/Worksheet/WorksheetNamedRangesTest.php b/tests/PhpSpreadsheetTests/Worksheet/WorksheetNamedRangesTest.php
index b367583b..506e753c 100644
--- a/tests/PhpSpreadsheetTests/Worksheet/WorksheetNamedRangesTest.php
+++ b/tests/PhpSpreadsheetTests/Worksheet/WorksheetNamedRangesTest.php
@@ -29,6 +29,15 @@ class WorksheetNamedRangesTest extends TestCase
         self::assertTrue($cellExists);
     }
 
+    public function testCellExistsUtf8(): void
+    {
+        $namedCell = 'Χαιρετισμός';
+
+        $worksheet = $this->spreadsheet->getActiveSheet();
+        $cellExists = $worksheet->cellExists($namedCell);
+        self::assertTrue($cellExists);
+    }
+
     public function testCellNotExists(): void
     {
         $namedCell = 'GOODBYE';
@@ -67,6 +76,15 @@ class WorksheetNamedRangesTest extends TestCase
         self::assertSame('Hello', $cell->getValue());
     }
 
+    public function testGetCellUtf8(): void
+    {
+        $namedCell = 'Χαιρετισμός';
+
+        $worksheet = $this->spreadsheet->getActiveSheet();
+        $cell = $worksheet->getCell($namedCell);
+        self::assertSame('नमस्ते', $cell->getValue());
+    }
+
     public function testGetCellNotExists(): void
     {
         $namedCell = 'GOODBYE';
diff --git a/tests/data/Worksheet/namedRangeTest.xlsx b/tests/data/Worksheet/namedRangeTest.xlsx
index a4383bb0..b0936a5a 100644
Binary files a/tests/data/Worksheet/namedRangeTest.xlsx and b/tests/data/Worksheet/namedRangeTest.xlsx differ