Originally Posted by birdeen's call
I don't think I ever heard wi[θ]out!
You haven't lived. My first headmaster (a Scot I think, anyway his name - McCaffery - suggested origins somewhere in the Celtic fringe) used it. But it's not common in my experience.
Originally Posted by thatone
without pronunciation: How to pronounce without in English
This, with an admittedly tiny sample size, tends to confirm Roach et al's figures (cited above by 5jj).