I saw this sudden change in my hotspot name. It has been months since I last used it. Is this something to be concerned about? My colleague also saw something similar where both his network name and password were changed to something weird.
You can see this post. The name can change if the internal app changes. So an upgrade of the apk or even if you upgrade the system can do this change.
You say in your comment that your colleague didn't made a system upgrade. Ok, maybe only upgrade his apps on play store. That's enough.