The following is a list of Royal Navy ship names by name in alphabetical order, both past and present. Many of the names have been re-used over the years and thus represent different ships.
(Note that this list still lacks many important ships.)
... (SIS/MI6)
Security Service (MI5)
Special Operations Executive (SOE in World War Two)
United States
Air Intelligence Agency[?] (AIA)
Army Security Agency[?] ...