My 2015 Owners Manual, Section 4 page 389, Contacts *Notice. Apparently of contacts are edited on the phone they ARE NOT updated in the car contacts. To update the contacts stored in the vehicle the procedure is to 'delete' the phone from the paired list in the car (that wipes out stored contacts and call history for that phone) . . . then, after editing the contacts on your phone as you normally would, just re-pair it and the edited contacts list will be automatically loaded into the vehicle again.
Simple as un-pair re-pair and your edited phone contact list is automatically updated for you!