Edit the Display Name for a contact in Contacts.app

Question

First off: I'm mass printing envelopes. I export my contacts (from Contacts.app) to vCard, then convert them to CSV, before using MS Word's built-in mass-mailing tool.

In my contacts, I've found it to be easier to make an individual contact for each person, so I can keep their email addresses and phone numbers sorted nicely. However, I'd like to have my cards addressed to the family, not just the individual.

TL;DR:

I'd like a program that will combine the spouse's name with the main contact's name, and store it either in the existing FN field of the card, or else add a new field (such as famName, etc.). I'd prefer a UI-based program, if available, but having found nothing that has this functionality built in, I wouldn't mind a simple regex-based script.

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Example:

Contact:

Export to vCard:

BEGIN:VCARD
VERSION:3.0
PRODID:-//Apple Inc.//Mac OS X 10.11.2//EN
N:Johnson;;;;
FN:Johnson
TEL;type=HOME;type=VOICE;type=pref:##########
ADR;type=HOME;type=pref:;;################;##########;##;#####;
NOTE:CLCC
CATEGORIES:Address Book
X-ABUID:6D98572D-5520-4E6E-9474-3294827D4D39:ABPerson
END:VCARD

You'll notice the two separate fields, N, and FN. The N field seems to be each part of the name, separated by semicolons. The FN field seems to be the display name (Although it probably stands for Full Name). It would be wonderful if I could find a way edit that field through the UI, but I can't find it.

Edit: If there is a spouse's name in the card, the card will look like this:

BEGIN:VCARD
VERSION:3.0
PRODID:-//Apple Inc.//Mac OS X 10.11.2//EN
N:Doe;John;;;
FN:John Doe
ADR;type=HOME;type=pref:;;##############;#########;##;#####;
item1.X-ABRELATEDNAMES;type=pref:Rebbecca Doe
item1.X-ABLabel:_$!<Spouse>!$_
CATEGORIES:Christmas Cards Set 2 2015
X-ABUID:3FD45D07-093E-446E-AB4B-3767FDEC1A15:ABPerson
END:VCARD

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Soooo:

Is there a way to Edit the Display Name (FN) through the Contacts.app UI?
If not, is there a way to edit it through any UI?
If not, is there an easy way to edit it programmatically? (I have access to Windows, too...)
If not, I'm open to any way to edit it programmatically... :)

Thank you all!

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Edit: After thinking about it for a while, I think an even better/easier way would be to take the spouse (first) name in the contact, and add it to the display name.

e.g.
First Name = John
Last Name = Doe
Spouse = Rebbecca Doe

Full Name (Display Name) = John & Rebbecca Doe

Answer 1

Hope this may help you somehow. Download Bento for Mac from here. Unfortunately, it's not supported by FileMaker anymore, but anyway it works fine even on El Capitan (I use it here :)) Open it and it will ask permission to access your Contacts. Allow it. This it will open very convenient interface for mass editing your Contacts in list and/or individually with ability to add your own fields. Cheers.