I can't even remember the number of times I've sparred with parts store counter clerks over my Merkur XR4ti.
I simply call it a MerKer to hold down the confusion and it matters not. I get into a "Mercury; what type of Mercury? Grand Marquis, Sable, or what?".
The correct pronunciation is Maar Koor. Lord knows what kind of turmoil would get stirred up if I kept it correct.