Hi,
This is not possible currently, but you can add it.
In www/administrator/components/com_awocoupon/assets/ps_awo_giftcert.php, around line 150ish is this line
<?php
$message = str_replace(array('{website}'),array(URL), $message);
?>
change it to
<?php
$sql = 'SELECT first_name,last_name FROM #__'.VM_TABLEPREFIX.'_order_user_info WHERE order_id='.$d['order_id'];
$database->setQuery( $sql );
$customer = $database->loadObject();
$message = str_replace(array('{website}','{first_name}','{last_name}'),array(URL,$customer->first_name,$customer->last_name), $message);
?>
Then within your email, use {first_name} and {last_name} to get the customer name.
Note, this is untested code, but it should work. I will make sure customer first/last name is in the next release.