diff --git a/src/String/StringTools.php b/src/String/StringTools.php
index <HASH>..<HASH> 100644
--- a/src/String/StringTools.php
+++ b/src/String/StringTools.php
@@ -107,6 +107,7 @@ class StringTools
     public static function makePlural($singular)
     {
         $singulars = [
+            'ey' => 'eys',
             'day' => 'days',
             "ch" => "ches",
             "s" => "ses",
Updating the string replacement to support for "ey"