Do you have access to the PHP code of this update bar ?
If so, some SQL clauses you'd have to add to the request which gathers results would do it (adding something like "WHERE id_forum !=7").
If not, I'm not sure you have settings for this. This is usually why using an open CMS is a better solution..
And by that I mean it has no effect on us if another clan is named that from another game
IIRC brand names don't conflict provided each has a different kind of activity/market. As always, law subject to heavy interpretation, and I don't specially advise you to follow its recommandation