Thank you for your replies.

I guess the logic behind this is: everyone knows excel and it's to costly to train employees to learn something new.

My point of view is, that it's very efficient to train your employees in basics of programming and databases, because communication with developers becomes smoother and users can execute simple tasks themselves

I used planets from the solar system.

For my WLANs I use random chemical elements.

For my PCs I use the noble gases.

Other ideas: botanical names, scientists, moons of a planet, minerals, stones