I just wanted to rule out that 1872 marriage definitively, in case somebody else came back to it as I did. I'd noticed that in the 1871 census your Eliza Jane was Elizabeth Jane, and wondered whether she might have exaggerated her age in order to marry. And then I couldn't find a Trevenen couple in the censuses to match.
So to start, the name was indeed Trewren.
James, son of George, a smith, and Jane, was baptised in August 1845 in Tuckingmill, born in January 1845.
http://www.cornwall-opc-database.org/search-database/more-info/?t=baptisms&id=845757There are apparently two births for that name in Redruth reg dist in 1845.
The family is in the 1851 census in Camborne - name mistranscribed at Ancestry as Trewsco and corrected to Trewren by an Ancestry user.
Eliza Jane Whitford #2 was probably born 1845 in Redruth (which covers Camborne), and is in the 1851 census in Veryan with parents James and Ann. It looks like she died aged 26, death reg March quarter 1873, Redruth.
I'd been hopeful there for a bit, but 'twas not to be.
Yes indeed, the mystery ones are the ones that make the whole endeavour entertaining! It's nice to find the odd one of them occasionally, though.
