HMS Blackfly Wikipedia
At least two ships of the Royal Navy have borne the name HMS Blackfly:HM Gunboat Blackfly, a Fly class gunboat built in 1916. She sank after colliding with a bridge in Baghdad on 16 May 1923 while loaned to the Air Ministry.
HMS Blackfly (FY 117), an anti-submarine trawler, requistioned in 1939. She was sold in July 1946.