TL;DR: Contact Management within the Beeper is not yet supported. Beeper will gather your chat names directly from the Chat Network in question.

On Beeper iOS and Beeper Android, the app will request your permission to access your contacts. This is only to Start New Chats. Currently, Beeper doesn't support customizing chat names.

For Google Messages, if you have everything setup under the same Google Account (Android Phone, Google Messages native app, and the connection in Beeper), updating your contact's names on the phone Contact's app should do the trick.

What contact systems does Beeper support?

• Apple Contacts (only supported on iOS)
• In-Device Contacts (only supported on Android)

Beeper Desktop

• Beeper will gather your chat information right from the Chat Network in question.
• For Google Messages, if you have everything setup under the same Google Account (Android Phone, Google Messages native app, and the connection in Beeper), updating your contact's names on the phone Contact's app should do the trick.

Beeper iOS 

• On Beeper iOS, the app will request your permission to access your contacts during the initial sign in. This is only to Start New Chats. Currently, Beeper doesn't support customizing chat names.
• For Google Messages, if you have everything setup under the same Google Account (Android Phone, Google Messages native app, and the connection in Beeper), updating your contact's names on the phone Contact's app should do the trick.
• You can manage this permission under iOS Privacy Settings → Contacts

Beeper Android

• On Beeper iOS, the app will request your permission to access your contacts during the initial sign in. This is only to Start New Chats. Currently, Beeper doesn't support customizing chat names.
• For Google Messages, if you have everything setup under the same Google Account (Android Phone, Google Messages native app, and the connection in Beeper), updating your contact's names on the phone Contact's app should do the trick.
• You can manage this permission under Android Settings → Apps → Beeper → Permissions → Contacts

FAQ

What Chat Networks does support starting a new chat?

Currently, Beeper only supports starting new chats on WhatsApp, Google Messages, Telegram, and Signal.

Does Contact Management sync across devices?

Contact Management doesn't currently sync between devices. Contact information will be stored locally on the device. 

What Contact Management does the mobile app use?

Each platform supports local contact management by providing access to the phone's contacts through settings; you can enable contact access by following the steps in this article.

Which Beeper client supports contact management?

Contact Management within the Beeper is not yet supported. Beeper will gather your chat names directly from the Chat Network in question.

I already have a contact picture for this contact, but I want to replace it with the one in my address book. How do I do that?

Depending on the chat network, this can happen automatically. However, some chat networks require you to do this in their own apps before Beeper can receive the information. If a contact already has a profile picture in the chat network, Beeper will always prioritize that picture over the one in your address book.