[Tex/LaTex] the correct pronunciation of TeX and LaTeX

Question

Is it tex(tech)?
Or
Is it tex(like touch)?

Lay-TeX?
or
La-TeX?

Should I use TeX pronunciation in LaTeX?

Answer 1

Let the creators of TeX and LaTeX answer:

Donald Knuth wrote in the first chapter of his TeXbook:

English words like ‘technology’ stem from a Greek root beginning with the letters τεχ...; and this same Greek word means art as well as technology. Hence the name TeX, which is an uppercase form of τεχ.

Insiders pronounce the χ of TeX as a Greek chi, not as an ‘x’, so that TeX rhymes with the word blecchhh. It’s the ‘ch’ sound in Scottish words like loch or German words like ach; it’s a Spanish ‘j’ and a Russian ‘kh’. When you say it correctly to your computer, the terminal may become slightly moist.

Leslie Lamport wrote in the first chapter of his book LaTeX: A document Preparation System:

One of the hardest things about LaTeX is deciding how to pronounce it.This is also one of the few things I'm not going to tell you about LaTeX, since pronunciation is best determined by usage, not fiat. TeX is usually pronounced teck, making lah-teck, and lay-teck the logical choices; but language is not always logical, so lay-tecks is also possible.