Room Names

I have a Sonos one that I was using on my Sonos 1 app and recently purchased some new Sonos Equipment and now I am using Sonos 2 app.

When I set up my new network I performed a factory reset on the Sonos 1 and named it kitchen but then decided to put it in my study and later on renamed it as Office.  This was ok but later on it renamed itself back to kitchen.  I have factory reset it a few times and it keeps on resorting back to kitchen which I replaced with an Sonos ERA 100.

In the system menu on the app, I keep on getting two kitchen listings and I cannot find a way of renaming the Sonos One without it changing on its own accord.

Does anyone have experience of this or able to offer assistance?

Thank you in advance.