Manual:$wgExtraGenderNamespaces/ja

詳細
Same as, but for namespaces with gender distinction (user space). 性別の区別が必要な名前空間が追加されている場合、自分で定義する必要があります.

例:

In this example the namespace name fallbacks to the MediaWiki default, so nothing needs to be added to.

In case the language of the wiki as set with the parameter has a native distinction of gender the change of the namespace's name will be done automatically for the ones provided natively by MediaWiki. In case you would like to prevent this from happening, you will have to override this by setting this parameter explicitly not to do this for the namespace and consequently for the associated talk namespace as well, e.g. for German:

Usually the female version of user would correctly be "Benutzerin" in German.