- English naturalist.
- U.S. army officer and politician: Speaker of the House 1856–57.
- Iain (Menzies). 1954–2013, Scottish novelist and science fiction writer. His novels include The Wasp Factory (1984), The Crow Road (1992), and The Steep Approach to Garbadale (2007); science-fiction (under the name Iain M. Banks) includes Look to Windward (2000)
- Sir Joseph . 1743–1820, British botanist and explorer: circumnavigated the world with James Cook (1768–71)
