Change the name of the wiki
It is possible to change the name of your wiki post-installation using the steps below.
Basic name change 
#$wgSitename = 'MyWiki'; $wgSitename = 'YourWiki';
Project namespace 
The project namespace can also be modified post-install. By default, this is the value of $wgSitename, although you could choose a shorter or different name. To do this, override the value of $wgMetaNamespace in LocalSettings.php, for instance:
$wgMetaNamespace = 'YourWiki';
Note: Editing the MediaWiki namespace will only have an effect if $wgUseDatabaseMessages is set to true. This is the default.