YOU have only read one of the previous answers to your query, if you read all of them, you will see the answer.
You have to remember that these people were probably illiterate, and would not know how to spell their names.
He was born but registered as HORNE.
Births Dec 1846
Horne George Thetford 13 291
He married in Erpingham Norfolk. and puts his name as HURN.
Marriages Dec 1865
Gotts Mary Erpingham 4b 177
Hurn George Erpingham 4b 177