When you're setting up your guest list in your Address Book, you'll have an option to add a "Secondary Name" to any email address. The Secondary Name is usually used when you send cards to a contact often, but need to use multiple names interchangeably (for example: Clayton Family, and/or Mrs. Clayton). The Secondary Name does not show up in conjunction with the primary name - you would need to select either one or the other to use on a recipient list.
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