I too pronounced it semetek for a while. Mainly because when I was first looking for Cemetech, from the About on a program for my 83p I grabbed (before I was introduced to Cemetech, TICalc.org, Omnicalc, etc), I found out that
Cemetech developed cemetery management software. The reason Cemetech also developed calculator programs was beyond me...
Then, of course, I discovered Cemetech.net -- which I was pleased to find did
not develop cemetery management software.... I guess someone's gotta do it, though
Now, thankfully, I find it very odd, out-of-place, and down-right silly to pronounce it semetek. I can't bring myself to do it ^^,