Windows 10: Trying to change 'FriendlyName' in registry

Shouldn't need to right click and select 'run as...' as I am the administrator, and regedit does ask if I want to allow changes.
I wasn't complaining about no response. I was just surprised as over the years on various Windows versions, these forums have always produced an answer!

not entirely true about being an Administrator...

"Run as Aministrator" is just a command, enabling the program to continue some operations that require the Administrator privileges, without displaying the UAC alerts.Even if you are a member of administrators group, some applications need the Administrator privileges to continue running, because the application is considered not safe, if it is doing some special operation, like editing a system file or registry entries.
If you execute the application with 'run as administrator' command, you are notifying the system that your application is safe and doing something that requires the administrator privileges, with your confirmation.



Back to the issue and assuming this is a AIO printer scanner

I had a smilar issue with a network scanner name and resolved this by creating a test Administrators account. The issue was not apparent in the new account so I assumed it was only a software glitch.

Back in the original account,
I turned off automatic setup of network connected devices in Advanced Settings within Network and Sharing CentreI removed all drivers especially from the PrinterServer properties type "Print Management" in Cortana, ensure you remove all printer driver packages. "You may need to turn of printer spooler in services manager "services.msc" and turn back on to allow you to delete all driver packages.

Reboot the PC

Installed the printer/scanner and it resoved my network name issue.

worth a try, otherwise I am at a loss without hands on, sorry

HTH

I am in serious danger of losing the will to live here!
I tried everything you suggested, thanks for that, but to no avail.
Creating a test admin account was interesting as the problem was not there. However, I did everything you suggested and still, no matter what, my AIO printer shows up in Scanners as 'Karas-iPhone'!
See attached snip. The printer can be seen as 'HP4520 Maggie' in Devices, but when I select 'Start Scan' from right click, it shows as 'Karas-iPhone'.
Again, I have removed all registry references to 'Karas-iPhone' but they just come back after a reboot.
I have wasted so much time on this, and don't want to be beaten!

Without being able to replicate the issue, I cannot add further comment except ....

As the test account did not have the issue, why not create a new account, transfer your information and delete the old one ?

or

One last try, registry files are cache like and so a cached copy maybe the issue, try deleting the offline file cache or reset the offline file cache

Good luck with your plight.

Solved it!
The solution was on the printer itself. Somehow, the 'Host Name' was set to 'Karas-iPhone'. Changing that on the printer has sorted everything out! How that new printer got that name I will never know. I know that doesn't explain why the test account didn't have the issue, but....
Anyway, thanks to everyone for their valued suggestions.

Glad you have it sorted.

Cheers