Belknap or Belnap is a surname of Norman origin from England that may come from the Anglo-Norman words "belle," meaning beautiful, and "knap," meaning the crest or summit of a small hill. Although today the "k" in Belknap is generally silent as in the words "knight" or "knee," it is evident from documents dating from the Middle English period that it was originally pronounced as a hard "k."[citation needed] The surname is relatively infrequent, and most Belknaps or Belnaps in America are thought to descend from one man, Abraham Belknap (formerly known as Beltoft), who migrated from Sawbridgeworth, Hertfordshire, England to Lynn, Massachusetts, about 1635. The surname continued in England. Today, a wide variety of locations and institutions are named Belknap or Belnap, all of which are believed to be connected in some manner to this early Puritan emigrant to America. Places named Belknap or Belnap include over 130 streets, approximately 20 towns, and 1 U.S. county. Natural features named Belknap range from a nunatak near the South Pole in Antarctica, to a Canadian cape near the North Pole, to a seamount beneath the Pacific Ocean between California and Hawaii, to a tiny rocky island in Indonesia in Southeast Asia.[1]
The earliest documentary reference to someone of this name is to John de Belknap, who first appears in Wiltshire in 1327. He later appears to have moved to London around the time the Black Death arrived in England. John was the father of Sir Robert Belknap, who served as Chief Justice of the Court of Common Pleas of England from 1377 to 1388. The early Belknaps married into a number of notable English families.
The surname Belknap, as carried through descendants of Sir Robert, appears to have died out with Sir Robert's great-grandson, Sir Edward Belknap (c. 1471 – 1521). However, several other males surnamed Belknap, whose connections to Sir Robert are at present unknown, were contemporaries of Sir Robert's family during the 15th and 16th Centuries. The Belknap surname may have continued through one of these other contemporaneous Belknaps through the Beltoft family of Sawbridgeworth, Hertfordshire, who would reside near several of the early manors of the early Belknaps and suddenly assumed or resumed using the surname Belknap in the late 1500s-early 1600s, not long before Abraham Belknap emigrated to Massachusetts in the 1630s.
Variations of the surname Belknap include Belnap, Bellnap, Belknappe, etc. Many persons who today spell the surname "Belnap" are known to descend from Jesse Belnap (1760–1854), American Revolutionary War soldier. He was the grandfather of Gilbert Belnap.