Yeah, I noticed the difference between the way the name is pronounced in MKT and MKD too (how anyone miss it?) ...
Personally, I prefer the MKT pronunciation; it really shouldn't have been changed.

same goes for Reiko in MK4 & MKD they pronounce it Ree-Ko in MK4 and RY-Ko in MKD

In MKT it sounds like AIR-mac. I like the way he pronounces it better in MKD but I don't like the announcer's voice in the game.

I must not have good hearing and I don't even listen to loud music. It sounds exactly the same to me, the only thing different is the voice. That's all I hear. I'll try to listen more closely.

I've always used and MK4 Reiko and MKD Ermac (yes, even before it came out)

i never liked the er-mic from before, it sounded ok, but not perticularly liked.
i thought er-mack was funny at first but i think it sounds ten times better then beforehand.

I dont really remember the Ermac from MkD, but I like the one of MKTrilogy a lot.

I usually pronounce it, UR-mac (UR as in HER). But AIR-mac makes sense, as that's how ERror MACro is pronounced. I can't remember how it's said in Deception.
Ka-Tra

I pronounce "Ur-Mac," which I guess is how they say it in Deception. I never really said it "Ehhr-mac," cause I thought that was Shao Kahn adding an unneccesary accent on the word.

That's a good point.
And for the record, I say REE-ko because that's how I said it before I even heard them say his name th in MK4 and Gold. Ray-ko justs sounds weird to me.

I like
RAYko (Mk4 style) better then REEko.
?

But REE-ko was how they said in MK4. Or am I insane?
EDIT: It was REE-ko, 'cause I remember I was once playing MK4 with a friend of mine and I picked Reiko and after the announcer said his name my friend added "SUAVE'" which I thought was really funny.

I always pronounced Ermac "Urmic".
I've also always pronounced Noob Saibot "Nube Seybit".
But it's just they way i speak.
Though i pronounce Reiko "Reeko"... But i like "Reyko" better.