Portia changed her name in 2010.
Portia didn’t change her name until 2010, more than a decade after she and Ellen married. She submitted her paperwork a month later, and her name change request was accepted soon after. Portia de Rossi became Portia Lee James DeGeneres due to the change.
On the other hand, Portia De Rossi has a very different recollection of her name’s origin. This was not the first time Portia went by a different moniker. When she was 15 years old, she changed her name from Amanda Rogers to Portia De Rossi because she had trouble determining who she was.