How to restore the full name from the abbreviated name of a person?

Question

Text Processing Automation

Hello. I am doing the processing of customer names for an online store.
It is necessary that the name "Kolya" be transformed into "Nikolai", the name "Vanya" into "Ivan", etc.
Have you met with something like this? Perhaps there are some bases of correspondences between the abbreviated and the full name?

Answer 1

Catch Names

Answer 2

Learned to search. But no, I don’t see what I would like in the first lines. Unfortunately. Poke me in the link, please.