Change iPhone 8 Plus Device Name From iPhone 6S Backup

Hi all

Well I just upgraded (!) to an iPhone 8 Plus. I backed up my old 6S with my MacBook Pro via Finder, and when setting up my iPhone 8 Plus I was presented with the option of setting up the phone with the restore function, using the backup I made from my 6S. All is fine on my 8 Plus, however, the device name is showing as iPhone 6S in iCloud on the phone, and on iCloud.com.

If I go to Settings > iCloud and scroll down to where my devices are listed, it display as '*My Name's* iPhone 6s' and underneath it displays 'This iPhone 8 Plus'. I have checked the name in Settings > General > About, and it is displayed there as *My Name's* iPhone 8 Plus.

Any idea how to change the device name to what it actually is?

Thanks!