There does seem variations of the surname HIERON
Forest of Dean Family History website
https://forest-of-dean.net  - has the Gloucestershire Marriage Bonds 1730-1823 and Marriage Allegations 1637-1837.
6 May 1775  - by Licence at Woodchester
John HIRON - aged 26, Batchelor, Rank/Profession: Dyer - residence: Woodchester
Sarah POWELL - aged 22, Spinster, residence: Woodchester
by Licence, the Bond gives, the Witnesses as Richard DAVIS, a Clothworker of Woodchester
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Hannah HIRON (aged 23) - married Joseph PEGLER  aged 23, occupation: Broadweaver 13 Woodchester - 13 September 1774.
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There are also the HIRON's of Frampton - on the same website.
Ancestry: has Hanah HIERON - marriage 15 September 1774, Woodchester - so different spelling.
By Googling: Hieron Woodchester
Google Books
The Poll at the election of a Knight of the Shire for the County....
WOODCHEFTER
HIERON Daniel - (of what Freehold consists - House and garden - his own
? next listed is
HAVEN Samuel - fen - house and land - his own
HEAVENS  Edward - ditto
? different variations of surname - are they linked, as above them is listed Minchinhapton - with Nath HIERON, 
Sarah POWELL - aged 22, Spinster, residence: Woodchester