Change site name - how to?

Change site name - how to?

Hi ALL.
We use SDP 14840 with AD sync.
Currently Requester's site name is syncing from AD (field name = office). Site Manager has access to all Requests of own Site.

Sometime we need rename Site. We do all changes in AD side and after some time new data sync to SD. All Requesters get new Site name but Site Manager loose access to old Requests own site (Request with OLD_site_name)
How we can rename Sites without loose access to old Requests ?

                  New to ADSelfService Plus?