Ind. Code § 31-33-26-17
(a) If a court grants a name change under IC 34-28-2 (or IC 34-4-6 before its repeal) to a person:
(2) whose name is maintained within the index in accordance with this chapter;
the person must notify the department regarding the name change not more than ten (10) business days after the court enters a decree changing the person's name.
As added by P.L.138-2007, SEC.67.