open the configuration menu on the upper left of the screen on your frontend. click on “configuration”. click on z wave on that page that opens.
In there you can change the node names which impacts entity_id of the associated devices. You’ll also have to deal with the entity_registry.yaml file too.
You can technically change the names of the entities there too but usually I just rename the node using the zwave config page, rename the entity_registry to some other name and then restart HA. then it will automatically take care of the rest.
On 0.75 you can use the entity registry via the UI - find the entity in the dev-states menu (looks like <> under Developer tools), select it, then click on the cog. From there you can change the friendly name, and the entity ID.