There are a few isolated occurrences of the Kelsall name in the Americas prior to the collection of census records.
The Moultrie/Bellinger tree which links a Kelsall family in the American colonies at the time of the Revolutionary War, with a family in the Bahamas and lines in England is told here. This line survives to Agnes Kelsall recorded in the 1790 census in Beaufort, South Carolina, and who died in about 1817.
Joseph Rodney Kelsall Croskey was born 12 April 1810 in Philadelphia son of Richard and Mary Frances Burt Croskey (Historical Society of Pennsylvania on FMP). From records on Ancestry, Mary Frances Burt Kelsall was born in Jamaica in 1789, the daughter of Frances and Henry Kelsall. She was baptized in 1791 (Jamaica, Church of England Parish Register Transcript). Mary Kelsall daughter of Joseph Rodney Croskey married Sir Henry Daniel Gooch 1865. Joseph Rodney Croskey was United States Consulate in Cowes, Isle of Wight in the 1840s and Consulate in Southampton in the 1850s. He died on January 25, 1886, in Chelsea, Middlesex. Another reference to Jamaica is to Sarah Kelsall who died there in 1734 aged 49 (Monumental Inscriptions of The British West Indies).
Admiral Norton Kelsall of the British Royal Navy married Joanna White September 29, 1726 in New York. She was the widow (nee Joanna Staats) of Leonard White, of the Bermudas, who came to New York about 1715 (The First Settlers of New Brunswick, William H. Benedict). There is a reference that Captain Kelsall commanded a brig that returned to Spanish Town, Jamaica on 14 November 1726 (Colonial Papers, America and West indies). I have found no other reference to Admiral or Norton Kelsall.