Tyack or Tyacke is a Cornish surname. It is an ancient surname and the Tyacks were landowners at an early period. It is thought to be derived from a Celtic word for ploughman. William Tyack was escheator of the Leeward Islands in the reign of James II. The Tyackes of St Breock bore the arms: Arg. a fesse (or a chevron) between three bears' heads couped Sa. Other bearers of the name: Dave Tyack, German musician David Tyack, American academic, Professor of Education Major General David Tyacke, British Army officer Jim Tyack, baseball player Les Tyack, Australian politician Ryan Tyack, Australian archer Sarah Tyacke, British historian of cartography Footnotes Logan TYACK