I just say Mr. Mxy

Is that Mixy, McSee or M-xee?

M-xee

Mixy-es-pittle-ick

I still don't know how to pronounce it. I say something like Mr. Myxpitlik.

I know it's wrong but I'm not able to do it better.

I was introduced to him via STAS so I use their pronunciation.

I can’t remember what comic it was in, but Julius Schwartz added an editor’s note with the pronunciations for the Earth-One and Earth-Two continuities. It was a Ambush Bug issue?

I don't.

Don’t know it’s so hard to prounce

I pronounce it like Mixy-a-spit-lik