the_modified_author filter-hook . WP 2.8.0

Filters the display name of the author who last edited the current post.

Usage

add_filter( 'the_modified_author', 'filter_function_name_437' );
function filter_function_name_437( $display_name ){
	// filter...

	return $display_name;
}

$display_name(string)

The author's display name.

Where the hook is called

return apply_filters( 'the_modified_author', $last_user->display_name );

Where the hook is used (in WP core)