HMS Spy
At least three ships of the Royal Navy have been named HMS Spy:

 was a Bonetta-class sloop launched at Rotherhithe in 1756.
 was launched at Topsham in 1800 as the mercantile vessel Comet. The Royal Navy purchased and renamed her in 1804.
 was a brigantine launched at Sheerness in 1841. See also
 Spy (ship)

Royal Navy ship names