When Google Assistant is linked to Smart We Link through Home Control, the list of devices shown, and their names should be dynamic, i.e. it should automatically change when the list of devices or their names are changes in the eWeLink app.
Currently, to add a new device or change the name of an existing device, you have to unlink your account from Google Home and then re-link it. This should not be necessary as other account links are able to dynamically change the list of devices.
I have just found out that a workaround is to tell Google "Sync my devices" This will force Google to resynchronise with all the linked services and re-obtain the list of devices.