Her certificate of death lists White’s legal name of Betty Marion Ludden. She took the last name of her husband Allen Ludden, to whom she was married from 1963 until his death in 1981, and reportedly called out for in her final words.
https://www.yournewsnet.com/story/45630726/updates-on-the-deaths-of-david-sassoli-bob-saget-and-betty-white