Do you want the Name Change process to be completely automated? I.e. when there is firstName or lastName change in Authz Source, you want the Email ID getting changed in ISC and eventually in AD as well?
Or, you want to perform those changes manually using SailPoint ISC Forms and Launchpad.
I have already executed the Name Change approach through option-1 which is completely automated and do not require any forms. Also, I have written couple of articles on Option - 1 which you can refer.
Design of Automated Name Change –>
How to perform the above implementation technically in SailPoint ISC?