It is possible to rename a form field programmatically using the SetFormFieldChildTitle function in Debenu Quick PDF Library.

Say for example that you have a parent field called Details, with child fields Name and Address, the full field names will be:

Details.Name
Details.Address

If you wanted to change Details.Name to Details.FirstName you can use:

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int FieldID = QP.FindFormFieldByTitle("Details.Name");
QP.SetFormFieldChildTitle(FieldID, "FirstName");