How to change the name shown in my PC when I connect my phone in MTP mode?
Edit the file /system/build.prop

Change the ro.product.model or ro.product.device or any other property that has your device name and reboot..

Note:
I think you need to uninstall your device drivers from your computer after doing that..

Ofcourse, this requires root access (yeah, no official OTAs), and also make sure to backup your build.prop