The Belgian polar explorer Adrien de Gerlache de Gomery named the northern boundary of the entrance to Waddington Bay as Cap Rasmussen during the Belgica expedition (1897–1899) . The evaluation of aerial photographs showed that there is no significant object for de Gerlache's designation in this area. In order to preserve the name, the UK Antarctic Place-Names Committee transferred it to the island described here in 1959. The Greenland-Danish polar explorer Knud Rasmussen (1879–1933) and the Danish painter Carl Rasmussen (1841–1893) are named as possible namesake in the literature .
- Rasmussen Iceland in the Geographic Names Information System of the United States Geological Survey (English)
- Rasmussen Island on geographic.org (English)
- John Stewart: Antarctica - An Encyclopedia . Vol. 2, McFarland & Co., Jefferson and London 2011, ISBN 978-0-7864-3590-6 , p. 1276 (English)