In the list of comments the author name will be hyperlinked, we can remove this hyperlink using the below function in functions.php
/** Removes link to comment author website http://www.iteamweb.com */
function author_link(){
global $comment;
$comment_ID = $comment->user_id;
$author = get_comment_author( $comment_ID );
$url = get_comment_author_url( $comment_ID );
if ( empty( $url ) || 'http://' == $url )
$return = $author;
else
$return = "$author";
return $return;
}
add_filter('get_comment_author_link', 'author_link');