Given the emphasis the WTS places on using and exalting the name "Jehovah," why do they allow JWs to refer to him as "Jah"?
I suppose it's a term of endearment and an abbreviation as in "hallelujah."
But, really, did the Israelites call Abraham "Abe"? Jacob "Jake"? Joseph "Joe"? Moses "Moe"? Joshua "Josh"? Samuel "Sammy"? David "Dave"? Solomon "Sol"?
Would a JW get away with referring to Russell, Rutherford, Knorr, and Franz as "Chuck, Joe, Nate, and Freddy"?