diff --git a/src/Support/Str.php b/src/Support/Str.php
index 9ed75c1f..896710c3 100644
--- a/src/Support/Str.php
+++ b/src/Support/Str.php
@@ -61,7 +61,7 @@ final class Str
     {
         $code = self::PREFIX.str_replace(' ', '_', $code);
 
-        return (string) preg_replace('/[^A-Z_a-z0-9]/', '_', $code);
+        return (string) preg_replace('/[^\p{L}_0-9]/', '_', $code);
     }
 
     /**
diff --git a/tests/Unit/TestName.php b/tests/Unit/TestName.php
index 3f52e700..2d5ce4aa 100644
--- a/tests/Unit/TestName.php
+++ b/tests/Unit/TestName.php
@@ -11,3 +11,23 @@ it('may start with P', function (string $real, string $toBePrinted) {
     ['PPPackages\Foo', 'PPPackages\Foo'],
     ['PPPackages\Foo', 'PPPackages\Foo'],
 ]);
+
+$names = [
+    'ふが' => '__pest_evaluable_ふが',
+    'ほげ' => 'ほげ',
+    '卜竹弓一十山' => '卜竹弓一十山',
+    '!p8VrB' => '!p8VrB',
+    '&xe6VeKWF#n4' => '&xe6VeKWF#n4',
+    '%%HurHUnw7zM!' => '%%HurHUnw7zM!',
+    'rundeliekend' => 'rundeliekend',
+    'g%%c!Jt9$fy#Kf' => 'g%%c!Jt9$fy#Kf',
+    'NRs*Gz2@hmB$W$BPD%%b2U%3P%z%apnwSX' => 'NRs*Gz2@hmB$W$BPD%%b2U%3P%z%apnwSX',
+];
+
+foreach ($names as $name => $methodName) {
+    test($name)
+        ->expect(fn () => static::getLatestPrintableTestCaseMethodName())
+        ->toBe($name)
+        ->and(fn () => $this->name())
+        ->toBe($methodName);
+}