Copy these codes into your my-hacks.php file;

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function comment_plugger($before = '', $limit = 5, $sep = ', ') {

        global $wpdb, $tablecomments, $id;

        $request  = "SELECT comment_author, comment_author_url, MAX(comment_ID) as comment_ID FROM $tablecomments";

        $request .= " WHERE comment_post_ID='$id' AND comment_approved = '1' GROUP BY comment_author, comment_author_url ORDER BY comment_ID DESC";

        $request .= ($limit > 0) ? " LIMIT $limit" : '';

        $commenters = $wpdb->get_results($request);



        if ($commenters) {

                $output = '';

                foreach ($commenters as $commenter) {

                        if (!empty($commenter->comment_author_url)) {

                                $output[] = '<a href="' . $commenter->comment_author_url . '" title="' . $commenter->comment_author . '">' . $commenter->comment_author . '';

                        }

                        else {

                                $output[] = $commenter->comment_author;

                        }

                }



                if (is_array($output)) {

                        echo $before.implode($sep, $output);

                }

        } else {

//      echo "No one...yet."

        }

}

(Click here for more info about configuring the my-hacks.php file)

 

And place the code below in your index.php file for function calling to return the commenters name;