This could be your William, but you need to view a marriage certificate for confirmed information re fathers name, etc.
(I note that William, named his first son "Thomas". Was this after his father?)
Baptismhttps://www.familysearch.org/ark:/61903/1:1:6NXB-FGSN?lang=en
1841 censushttps://www.familysearch.org/ark:/61903/1:1:MQTG-9CN?lang=en1851 census https://www.familysearch.org/ark:/61903/1:1:SGJX-8DL?lang=enThomas HAMYLN married Susanna ASHTON on 13 Apr 1811 in Clovelly, Devon
Children baptised in Clovelly:-
Mary HAMYLN 1812
Thomas HAMYLN 1814 (father a farmer)
John HAMYLN 1816 (father a farmer)
Johanna Ashton HAMYLN 1817 (abode Stitworthy, father a farmer)
Catharine HAMYLN 1820 (abode Stitworthy, father a labourer)
Charlotte HAMYLN 1822 (abode Stitworthy, father a labourer)
Robert Aston HAMYLN 1823 (abode Stitworthy, father a labourer)
William HAMYLN 25 Feb 1827 (abode Stitworthy, father a servant)
Anne HAMYLN 1828 (abode Stitworthy, father a servant)
William HAMYLN 1 Jan 1831 (abode Stitworthy, father a servant)
Susanna Hamlyn (nee Ashton) burial 22 Mar 1846 All Saints Clovelly
Thomas Hamlyn died 1857 Bideford Union (age 73)