I haven’t been able to find this through iOS but maybe the car has an option in its setting to change the name of it. Looks like it maybe takes the name from the Bluetooth list and it’s absolutely ludicrous that iOS doesn’t allow you to rename Bluetooth devices in 2020. At work, we have a fleet of about 30 Ford Tauruses/Explorers and 10 Dodge Chargers and I have no clue which Bluetooth profile belongs to which car. Just says Sync and U-Connect in a very long list. Absolutely ridiculous!