get_taxonomy_name.php

global $wp_query;
    $term = $wp_query->get_queried_object();
   $title =  $term->taxonomy; 
   //var_dump $term to see all the stuff you can get
   //if its  a tag we want Tag not post_tag.... its the slug...
   if($title == 'post_tag'){
	   echo 'Tag';
	   }
   else{
   	echo ucwords( $title);
   	}