Index: wp-admin/includes/upgrade.php
===================================================================
--- wp-admin/includes/upgrade.php	(revision 37287)
+++ wp-admin/includes/upgrade.php	(working copy)
@@ -191,7 +191,7 @@
 	$wpdb->insert( $wpdb->term_relationships, array('term_taxonomy_id' => $cat_tt_id, 'object_id' => 1) );
 
 	// Default comment
-	$first_comment_author = __('Mr WordPress');
+	$first_comment_author = __('A WordPress Commentor');
 	$first_comment_url = 'https://wordpress.org/';
 	$first_comment = __('Hi, this is a comment.
 To delete a comment, just log in and view the post's comments. There you will have the option to edit or delete them.');