A friend of mine pointed out this site, and your message(s) in particular.
As far as I know, my Porteous family hails from Yorkshire (Dunnington and Elvington, both near York). In my research, I have come across a variety of spellings including, but not restricted to Portas, Portes, Portus, Portice, Porteus and Portis. In the 1861 census of Ontario, Canada, our name has the latter spelling, providing a clue as to its pronunciation at that time.
I suspect that the Porteous/Portas families in both Lincolnshire and Yorkshire may be related, and am interested in instances of the surname in both jurisdictions.
By the way, my Dunnington-born ggg-grandfather, George Porteus (1789-?), is identified as the son of William Portas (confusing, all of those spellings).
--Doug