[FEATURE] Variable name generator

[AlekSi]

Is your feature request related to a problem? Please describe.

It would be nice to have a function/method to generate a valid variable name in most programming languages: [_a-zA-Z][_a-zA-Z0-9]*.

Describe the solution you'd like

Any method to generate that value.

Describe alternatives you've considered

Find something like that in documentation (it wasn't easy, by the way).
Do it my own code.