Lionel D. Barnett's biographical information is not available in the provided text.
The provided text details the origins and historical usage of the surname 'Newman,' tracing its roots to Old English words for 'new' and 'man.' It suggests the name likely originated as a descriptor for a newcomer or settler. The text then presents an extensive list of notable individuals bearing the surname Newman across various fields, including arts, sciences, sports, politics, and entertainment. These individuals span different nationalities and historical periods, illustrating the widespread adoption of the surname. However, the extract does not contain any biographical information specifically about Lionel D. Barnett.