Name change in header details

Dear All,

Could any one plz tell me how one employee's header name changes to other employee?

some times header change with name change also(0002 infotype) occurs.

Most of the cases will have data in 31 infotype but no user is using 31 infotype & 121 infotype.

P0001-ENAME = P0002-VORNA P0002-NACHN (Standard SAP Settings).

P0001-ENAME also one of the header fields which have been used for all infotypes.

Now for some employees, ENAME is not coming as VORNA NACHN. It is getting replaced by some existing employeeu2019s name.

Regards,

durai