IS Universal Name Registry - Remove Items?

We have recently added entries to the IS Universal Name Resgistry by populating the Universal Name section of an objects property using Developer. We are using a flow service to parse over these entries based on a key word by listing the entries in the Registry using pub.universalName:listAll serivce. However, we have some entries that need to be removed from the Registry, although we have removed the name from the properties section in Developer and saved, this did not remove the entry from the Registry. We do not see a similar service for removing entries in pub.unverisalName* , does anyone know where these entries are stored and how can we remove an entry?

Is it possible that there might be other IS services with the same universal name properties?