Corn Porter: this occupation title usually refers to someone who worked at a dock. They unloaded corn from ships and moved it into storage, and vice versa.Could it be Corn Porter - did he work in a dock?
https://www.familyresearcher.co.uk/glossary/Dictionary-of-Old-Occupations-jobs-beginning-C9.html
Do you have the person on a census to compare?
If by chance whe wwas the lass Baptised at Bishops Stortford,
Name: Mary Dunnage
Gender: Female
Baptised 31 Aug 1828 Saint Michaels,Bishops Stortford,Hertford,England
Father: Michael Dunnage
Mother: Ann
FHL Film Number:991308
Perhaps the father's name of John was confused with her Husbands name. I've had many similar errors on marriage records.
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