CUCM knows the phone's name. So make CUCM send the name in the p asserted identity.
The phone is a phone. It has a phone number, not a name. You shouldn't care if your Avaya phone sends a name or not in PAI. CUCM will handle that phone's calls and if CUCM is, for example, routing a call to the pstn from that Avaya phone, CUCM needs to ensure the name is in PAI going out.
Anyway, you can't set that in 46xxsettings - that's a general config file that applies to many phones.