Hi KSD
I've got a reference to a Uriah Boswell who was granted a pedlar's certificate at Portsmouth, Hampshire, in 1871, but unfortunately don't have the full details. If you were able to look at the certificate register itself (which is probably located at the Records Office in Portsmouth) it may include Uriah's age and place of abode.
In terms of possible alternative spellings of Uriah, you could consider Yuri, Yui or even Riah.
Best wishes
Sharon