How to create an Unique ID from entered data?

I would need a field with this calculation:

The first 3 characters of a field (name) +

The first three characters of a field (surname) +

random number (unique)

It's possible ?

Thanks

Thaca can be achieved with the Substring widget, Random Value Generator widget, and few conditions. 

How to Pass Field Value to Another Field?

Here is a demo form - https://form.jotform.com/83124909396970

Feel free to test it and clone it.