Trench is a surname.
The Trench family supposedly originated in County Galway, Ireland as descendants of Frederic de la Tranche, a 16th-century Huguenot immigrant from Normandy, and his wife Margaret Sutton, a possible Northumbrian.
[1] The peerage titles Baron Ashtown, Baron Kilconnel, Baron Trench, Earl of Clancarty, Marquess of Heusden and Viscount Dunlo have been held by various members.