Display order of category names

Hi everybody,

on our book review blog, every category is the name of a a books author, e. g. “The old man and the sea” is filed under “Ernest Hemmingway”.

Is there any way to alter the output on the archives pages since I would like the categories to be sorted by the surname (e. g. “Hemmingway, Ernest”). Since the author shall be shown correctly with first and surname on the single pages, I somehow need to versions of every category.

This is the code I’m using for the category index:

<?php
	$taxonomy = 'category';
	$param_type = 'category__in';
	$term_args=array(
	'orderby' => 'name',
	'order' => 'ASC'
	);
	$terms = get_terms($taxonomy,$term_args);
	if ($terms) {
	foreach( $terms as $term ) {
	$args=array(
	"$param_type" => array($term->term_id),
	'post_type' => 'post',
	'post_status' => 'publish',
	'posts_per_page' => -1,
	'caller_get_posts'=> 1
	);
	$my_query = null;
	$my_query = new WP_Query($args);
	if( $my_query->have_posts() ) {  ?>
	<h2 style="margin-bottom: 0px;"><?php echo $term->name;?></h2>
	<?php
	while ($my_query->have_posts()) : $my_query->the_post(); ?>
	<a>" rel="bookmark"><?php the_title(); ?></a>
	<?php
	endwhile;
	?>
	<?php
	}
	}
	}
	wp_reset_query();  // Restore global post data stomped by the_post().
	?>