You don't need to remember any name, you only need to try with all your possible email addresses you might have used, and press the "Email order history", until you'll find the correct one, because you'll received your Order History to that mailbox.
This will give you the Order Number, which can be use to retrieve your Serial Number, which can be used to reactivate the product.
In case you can't access your email anymore, send us an email with the email address you can't access anymore, and we can update your order with any email you want, which can then be used to retrieve your Order History.