example:
List
Guido bla1 ...
Mike  bla2 ...
Klaus bla3 ...

reference list
Guido Meyer
Mike Smith
Klaus Rothschild

so the new list should be
Meyer bla1 ...
Smith bla2 ...
Rothschild bla3 ...

I do it now, by putting the reference list in a hash
and then I parse the list lane by lane, split the lane, exchange the identifier 
and write a new list