Jan Van der Eecken (6/18/2013)
May I humbly ask why you want to do this in the first place? My first name is Jan, which is both Dutch, Afrikaans and Polish (and probably exists in a few more languages), but it is an abbreviation of Johan/Johannes/Johannis/Ioannis, which could be Jean in French, Juan in Spanish, Ian in Irish/Scottish, and whatever else. The possible derivations will go down endlessly the further you go down the tree.
We do not need actually all countries / all languages abbreviation, Usa / English will be enough.
We have clients database with first name / last name, so when user try to add new client we need to check exists clients and offer to choose already created clients by search them by First / Last name. We accept that user can do mistakes and just enter i.e. Alezander instead Alexander, but if user enter Alexander and there already user with name Alex (with same Last Name) we should offer user to choose correct client from list.