Dean of law at the University of Waikato, Professor Bradford Morse, said everyone had a legal right to change their name.
Convenor of the criminal law subcommittee at the New Zealand Law Society, Jonathan Krebs, said a person's previous name remained on record so if Goodwin was charged again, her earlier discharge would be apparent.
Goodwin said she changed her name for personal reasons including a divorce, because she was adopted, and because her previous last name didn't reflect her religion.
Lowenthal was a Jewish name, said Goodwin. "I don't have any Jewish blood."
She said she had been thinking about changing her last name to Goodwin since 2005, as it was the name of a dear friend who was unable to have children.
"I've done a whole lot of decent things in my life. I have a deep sense of shame of that (drink-driving) and I don't defend it, I own it. It's a small blight on a very responsible record in practising medicine," she said.
Hamilton District Court judge Arthur Tompkins had said a conviction would "preclude her from continuing to make the very significant contribution she has in the past made to oncological and palliative care needs".
Convenor of the criminal law committee at the Auckland District Law Society Marie Dyhrberg said it was likely Goodwin was trying to do well by her clients. She said the court "recognised her good work and treated her in a particular way in that she can continue her work", and a name change allowed her to do so.
Goodwin said she believed her change of name was being raised because Waikato Hospital was "aggravated that I opened a private practice and am speaking against them because they were bullying their staff about fluoride".