Nicknames on Habr and in general.

With one colleague, we decided to conduct an experiment in which we are trying to find out how people choose or invent nicknames for themselves, and to understand whether there is any rule / desire / psychology / attachment behind this.
Let it be a little Habrexperiment.

I would like to ask the Khabrovtsev on what grounds you came up with a nickname.

If there are people who want to talk about their nickname, we will be grateful.