In this we get only root category name.
get store category and check with if condition that is category is more then is 0 or not.
Then use foreach loop print root category name.
Here is code......
<?php $gethelper = Mage::helper('catalog/category');
$rootcate = $gethelper->getStoreCategories();
if (count($rootcate) > 0)
foreach($rootcate as $category)