WordPress orderby second word of meta_value

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I have a page template “By Author” (ID 1814) I am using to query my posts (Title: book titles & Content: descriptions) by meta_key: author_name, which equals both the book author’s first & last name_ However, I would like to order these posts by just the author’s last name — the second word in the meta_value. I am able to filter get these results in the loop by using: 

$values = get_post_custom_values("author_name");
$alpha = end(explode(' ',$values[0]));

But I don’t know how to get these posts to order by this result not by author_name’s first name. I found the query below for the functions.php file, which I think puts me on the right path but returns a 404 error on my page when I use it.

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Code from here: http://randyhoyt.com/wordpress/custom-post-type-ordering/

I haven’t even added the SQL query to explode (or whatever it is in SQL not PHP). Not sure if that code isn’t working because I am querying on a page template and not an archive.php file? Any suggestions to get me on the right path? 

add_filter('posts_join', 'author_join' );
function author_join($wp_join) {
    if(is_page(1814)) {
        global $wpdb;
        $wp_join .= " LEFT JOIN (
                SELECT post_id, meta_value as author_name
                FROM $wpdb->postmeta
                WHERE meta_key =  'author_name' ) AS DD
                ON $wpdb->posts.ID = DD.post_id ";
    }
    return ($wp_join);
}

add_filter('posts_orderby', 'author_order' );
function author_order( $orderby ) {
    if(is_page(1814)) {
            $orderby = " DD.post_title ASC";
    }
    return $orderby;
}
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  1. I’ve dealt with a similar issue where band names starting with “The …” were alphabetically ordered at T. The fix I implemented was to reverse the order of the name in the database to satisfy the MySQL query, and then the display page can use a string function to reverse the name back to the proper order.

    Something like this on the display page would fix the output:

    // The author's name, reverse ordered.
$author_name = 'Doe,John';

// Break the full name into its parts.
list($last_name,$first_name) = explode(',',$author_name);

// Then display the name in the correct order.
echo(first_name.' '.last_name);