It's not "a duplicate name". It's the name of somebody named "Duplicate".
You think I'm kidding, but no.
And Duplicate's last name isn't Obama, it's Obado.
And two entries in Marriage by Groom Index for Obado in the 1960-1965 book:
http://myveryownpointofview.files.wordpress.com/2011/03/ptdc00042.jpg
Those people must be on drugs.
So what nickname for someone with the first name “Duplicate”? “Dupie”?
HAHAHAHA! Instead of Pete and Re Pete, we have the feminine form of Mae and Duplicate Mae, lol!