Handling User Id Change in AIX

Hi,
I have a query that suppose the first or last name of the user changes and we need to change its userid for aix too. Then in that case how do we handle this scenario??I guess we can't change the user id so we should re-create the new id and associate all the data of the old id. But I donno how exactly to handle this situation of associating the data, so that there is no data loss. Please let me know if somebody has ever come across this case.

Thanks in advance,
Tintin

create new user and move user files to new location then just run chown -R accross files.