Henry was born in 1856 in Southampton, Hampshire, with his birth registered as Henry Huntington. His mother lived with John J Caplin and he used the name Caplin by the 1871 census.
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Birth: HUNTINGTON, HENRY COX GRO Reference: 1856 J Quarter in SOUTHAMPTON Volume 02C Page 23
age 5 Henry Huntington "England and Wales Census, 1861", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M71B-XTP : Sun Mar 10 13:24:10 UTC 2024), Entry for John Huntington and James Huntington, 1861.