Advanced sorting of a built-in list

[Whisper40]

Thanks for the answer !
Yes, I understand your grouping between name and first name, but I need to separate them to use them in other functions.

But your code use the sort function :)
My wish is not to use the sorting function but rather to do it by hand.
As you can see I already realized the process with the sorting function but this time I want to do it completely by hand.

Thanks for all !