I have to be honest, first time I have ran across this Question?
I pronounce it as ("Mac"-A-fee) -McAfee) But then again I am from the South.
Some people call it (Big-Mac)....
Intel would like us to pronounce it 'Intel Security.'
The fella in this video--Mike Carpenter, Senior Vice President, North America Sales, McAfee--pronounces it MAC-AFEE --> McAfee & Intel Security | McAfee Products.
The techs at my location use either.
Po-ta-to - Pah-tah-to, as they say.