diff --git a/typo3/sysext/core/Classes/Log/Writer/FileWriter.php b/typo3/sysext/core/Classes/Log/Writer/FileWriter.php
index 2a70835c1c6a7b34363beb6469fb8b8a2e92a7b2..cbc1fbf33831d44bf080b52c38f476643a0df1f0 100644
--- a/typo3/sysext/core/Classes/Log/Writer/FileWriter.php
+++ b/typo3/sysext/core/Classes/Log/Writer/FileWriter.php
@@ -34,6 +34,11 @@ class FileWriter extends AbstractWriter
      */
     protected $logFile = '';
 
+    /**
+     * @var string
+     */
+    protected $logFileInfix = '';
+
     /**
      * Default log file path
      *
@@ -90,6 +95,11 @@ class FileWriter extends AbstractWriter
         }
     }
 
+    public function setLogFileInfix(string $infix)
+    {
+        $this->logFileInfix = $infix;
+    }
+
     /**
      * Sets the path to the log file.
      *
@@ -256,7 +266,11 @@ class FileWriter extends AbstractWriter
      */
     protected function getDefaultLogFileName()
     {
-        return Environment::getVarPath() . sprintf($this->defaultLogFileTemplate, substr(GeneralUtility::hmac($this->defaultLogFileTemplate, 'defaultLogFile'), 0, 10));
+        $namePart = substr(GeneralUtility::hmac($this->defaultLogFileTemplate, 'defaultLogFile'), 0, 10);
+        if ($this->logFileInfix !== '') {
+            $namePart = $this->logFileInfix . '_' . $namePart;
+        }
+        return Environment::getVarPath() . sprintf($this->defaultLogFileTemplate, $namePart);
     }
 
     /**
diff --git a/typo3/sysext/core/Documentation/Changelog/master/Feature-85236-AddedInfixOptionToDefaultLogFileNamesForFileWriter.rst b/typo3/sysext/core/Documentation/Changelog/master/Feature-85236-AddedInfixOptionToDefaultLogFileNamesForFileWriter.rst
new file mode 100644
index 0000000000000000000000000000000000000000..7eaa39e3395d3da46a983d5a84238e12fa37e4f7
--- /dev/null
+++ b/typo3/sysext/core/Documentation/Changelog/master/Feature-85236-AddedInfixOptionToDefaultLogFileNamesForFileWriter.rst
@@ -0,0 +1,34 @@
+.. include:: ../../Includes.txt
+
+=============================================================================
+Feature: #85236 - Added infix option to default log file names for FileWriter
+=============================================================================
+
+See :issue:`85236`
+
+Description
+===========
+
+A new option :php:`logFileInfix` for the :php:`FileWriter` has been introduced.
+This allows to set a different name for the log file that is created by the :php:`FileWriter` without having to define a full path to the file.
+
+The example configuration will use the log file named 'typo3\_special\_<hash>.log'
+for any log message stemming from a class from the :php:`\Vendor\ExtName\` namespace.
+
+.. code-block:: php
+
+   $GLOBALS['TYPO3_CONF_VARS']['LOG']['Vendor']['ExtName']['writerConfiguration'] = [
+     \TYPO3\CMS\Core\Log\LogLevel::INFO => [
+       \TYPO3\CMS\Core\Log\Writer\FileWriter::class => [
+         'logFileInfix' => 'special'
+       ]
+     ]
+   ];
+
+
+Impact
+======
+
+The behaviour for existing :php:`FileWriter` configurations is not changed.
+
+.. index:: LocalConfiguration, ext:core