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Mediawiki sends all notification mails about changed pages using the sender name "WikiAdmin". 

This is hardcoded in includes/UserMailer.php, line 484:
    $adminAddress = new MailAddress( $wgPasswordSender, 'WikiAdmin' );

Now imagine you are working on multiple wikis - all will send you mails with the sender name "WikiAdmin", only the sender mail address differs ($wgPasswordSender).

Please replace the hardcoded "WikiAdmin" with a configurable variable (which would default to WikiAdmin). Something like this:
    $adminAddress = new MailAddress( $wgPasswordSender, $wgPasswordSenderName );