Check for business register of companies of your country, such change should be visible there.jumanirohan said:Thanks vensak , I will have to search news and other stuff relating to change of name. Since, I am not part of the organisation, I will not have a note stating the change of name, which is in your case.
Official statement in several newspapers is also good one and also if there was some statement from new company about how long you worked there where they can see matching adress and phone numbers.