The uclaPersonMiddleName is the last 4 digit of the social security number of the person represented by the identity entry in the UCLA Enterprise Directory.
The Enterprise Directory retrieves the last 4 digit of SOC_SEC_NUM from the UID system via the Campus Data Warehouse (CDW) in realtime manner.
UID system managed by Financial Aid and Shared Systems, Student Applications, AIS
For students, contact data owner UCLA Registraror's Office.
For employees, contact data owner UCLA Payroll Office.