Piwik\Site::getNameFor PHP Method

    public static function getNameFor($idsite)
    {
        return self::getFor($idsite, 'name');
    }

 public function configureTopMenu(MenuTop $menu)
 {
     $userPreferences = new UserPreferences();
     $idSite = $userPreferences->getDefaultWebsiteId();
     $tooltip = Piwik::translate('Dashboard_TopLinkTooltip', Site::getNameFor($idSite));
     $urlParams = array('module' => 'CoreHome', 'action' => 'index', 'idSite' => $idSite);
     $menu->add('Dashboard_Dashboard', null, $urlParams, true, 1, $tooltip);
 }