Getting Category Name from Portfolio

I need to get the category name in order to do some stuff with a menu. Would be easy but this is from a portfolio so normal ways don’t work. Here is what I have.

// Register portfolio taxonomy.
		register_taxonomy( 'portfolio-category', 'portfolio', array(
			'labels' => array(
				'name' => __( 'Portfolio Categories', 'eqfw' ),
				'singular_name' => __( 'Portfolio Category', 'eqfw' ),
				'search_items' =>  __( 'Search Categories', 'eqfw' ),
				'all_items' => __( 'All Categories', 'eqfw' ),
				'edit_item' => __( 'Edit Category', 'eqfw' ),
				'update_item' => __( 'Update Category', 'eqfw' ),
				'add_new_item' => __( 'Add New Category', 'eqfw' ),
				'new_item_name' => __( 'New Category Name', 'eqfw' ),
				'menu_name' => __( 'Categories', 'eqfw' )
			)
		) );

and I am trying to jsut return the category name using something like the below.

$obj = get_post_type_object('taxomies');
print $obj->taxonomies->singular_name;

Any ideas?