Sarnidac the Dwarf wrote:

By the way, so many people have misspelled the name of Sarnidac that I have come to believe that Lord Dunsany created the name with the specific purpose of imitating the halting gait of the dwarf. And because of this there is a certain reluctance to pronounce it, and people subconsciously fabricate an alternative that better suits their palate.

I think that sounds like a very interesting theory.