How to keep original Uploaded File Name in SharePoint Document Library?

HI,

I have document library. After Uploaded the file in document library. I want to keep the file name in some other filed.

Why because in future i may change the file name in document library so in order to know the original name of the file.

I want to do without any workflow. Is there any other default column like that?

How could i achieve it?

Thanks & Regards

Poomani Sankaran