Mac messages show phone number and not contact name
I just purchased a Mac Air and I have been trying to find a solution to a problem I have with the messaging app. When I send or receive messages on the app, the conversation is referenced by my contact's phone number and not my contact's name. My iPhone and Mac are synced through the iCloud and messaging is enabled. I also have my Buddies names checked off to appear while they do not show. How do I get my contact's names to appear in messaging versus their phone number?
MacBook Air (13-inch, Early 2014)