So, Blackwater not long ago changed its name to Xe, pronounced [zi:]. Twice now, as of tonight, I've heard people refer to the new name as 'unpronounceable'. (See here for a written example.) [zi:] is about as easy to pronounce as English syllables get.
Of course, the match to the spelling is a disaster (hey, it's Blackwater, they're specialists), but that's different. Another example of the assumption that language is just spelling?