why would a male employee, be using two surnames

[abbeygreen]

I have recently returned to work. One of my employees left without notice.
It has now been brought to my attention that he is going by 2 surnames. the one on his driving licence is a new one that he says he changed his name at some point. the other is on a HMRC Letter with a tax code amendment under a name that was his original surname of birth (I know this because speaking to someone who used to be married into his family0 But they have no idea where this surname on the driving licence has came from. Also in all forms completed by him on his employment he uses the driving licence (new) name.
why would HMRC be using original name and driving licence show this new name. Also if he goes by the date of birth he has gave me then I would eat my hat as it states that he is 2 years younger than me which would make him 35 and he looks over 45.

Sorry If this all sounds confusing but I am also confused?

I think the pertinent point here is that he is an ex-employee.

Mind your own business and stop snooping. You have no reason to be asking around and absolutely no right to disclose personal data about employees/ex-employees or anyone else connected with your work without their express permission unless you suspect a criminal act. If you do suspect a criminal act you make a disclosure to the relevant official body. You do not start playing Miss Marple.

I have two names. Quite legitimately and the one on my driving licence is different to the one on my passport and tax affairs(!) except that it's not different to the latter because I supply both for my tax return with one in the other names bit.

It's people like you that keep people like me in business cleaning up the mess.