Clapp
Clapp, or Clap, is an English surname, most commonly found in the West Country and in the United States. The word signifies rough ground, or a small hill.
Some men who brought the surname "Clapp" to America include:
Captain Roger Clapp, who came to the New World on the ship Mary and John, which landed at Nantasket (now Hull, Massachusetts), on May 30, 1630. He helped establish the town of Dorchester, Massachusetts, soon afterward. He worked for many years in important positions for the town and in the military organization, including a long period as commandant of Castle Island.