- Gilbert, William Gilbert, William S. Gilbert, William Schwenk Gilbert, Sir William Gilbert - a librettist who was a collaborator with Sir Arthur Sullivan in a famous series of comic operettas (1836-1911)
--1 is a kind of librettist; poet
- Gilbert, William Gilbert - English court physician noted for his studies of terrestrial magnetism (1540-1603)
--2 is a kind of doctor, doc, physician, MD, Dr., medico; physicist