William Hennah was born around 1765 and died in Tregony in 1832. He served in the Royal Navy.
Sons who served as naval officers: Edward Hennah
Companion of the Most Honourable Order of the Bath (CB) on 26 Sep 1831
Son of the Rev. Richard Hennah.
• As First Lieutenant of Mars, 74 (Captain George Duff), he took part in the Battle of Trafalgar (21 Oct 1805).