sentences:  The name Hercas first appears in the Orkney Islands in the 1500s.Harcus is "the present Orkney spelling of Harcarse" according to George F. Black in "The Surnames of Scotland".The names of Robert, Johnne, and George Hercas are named in the Respite of 1539 for complicity in connection with the Battle of Summerdale, 1529.