Question: What is the name of the island named after a medium-sized marine mammal in the order Sirenia?

Context paragraphs:
Northcoast Marine Mammal Center: The Northcoast Marine Mammal Center (NMMC) is a non-profit organization dedicated to the rescue and rehabilitation of stranded, sick or injured seals, sea lions, dolphins, porpoises and whales along the northernmost coast of California.  The Northcoast Marine Mammal Center is funded by donations and grants and has a large volunteer force which allows it to accomplish its mission.  The Northcoast Marine Mammal Center is located in Crescent City, California and has operations that cover a significant portion of the region.

United States Marine Mammal Program: The United States Marine Mammal Program is an organization developed by the United States National Committee and the International Marine Mammal Working Group of the International Biological Program in 1969, for the study of marine mammals.

Marine Mammal Protection Act: The Marine Mammal Protection Act (MMPA) was the first act of the United States Congress to call specifically for an ecosystem approach to wildlife management.  It was signed into law on October 21, 1972 by President Richard Nixon and took effect 60 days later on December 21, 1972.  MMPA prohibits the "taking" of marine mammals, and enacts a moratorium on the import, export, and sale of any marine mammal, along with any marine mammal part or product within the United States.  The Act defines "take" as "the act of hunting, killing, capture, and/or harassment of any marine mammal; or, the attempt at such."  The MMPA defines harassment as "any act of pursuit, torment or annoyance which has the potential to either: a. injure a marine mammal in the wild, or b. disturb a marine mammal by causing disruption of behavioral patterns, which includes, but is not limited to, migration, breathing, nursing, breeding, feeding, or sheltering."  The MMPA provides for enforcement of its prohibitions, and for the issuance of regulations to implement its legislative goals.

Sea Cow Island: Sea Cow Island, also known as Île Vache Marine, is a round 18 ha island on the Great Chagos Bank atoll of the Chagos Archipelago in the British Indian Ocean Territory.  It was named after Dugongs that were once abundant in the area although they became regionally extinct.  It is the smaller of the two islands in the Eagle Islands group on the western side of the atoll and forms part of the Chagos Archipelago strict nature reserve.  It has been identified as an Important Bird Area by BirdLife International because of its significance as a breeding site for brown noddies, of which 11,500 pairs were recorded in a 2004 survey.

British Divers Marine Life Rescue: British Divers Marine Life Rescue (BDMLR) is a British charity established in 1988 and is the United Kingdoms leading marine mammal rescue organisation.  The organisation's main areas of operation are within the United Kingdom and its territorial waters, however are often requested by international governments and charitable organisations to provide assistance and training in marine mammal rescue due to their vast wealth of knowledge, experience and available equipment.

Marine Mammal Stranding Center: The Marine Mammal Stranding Center (established in 1978) is a private non-profit organization located in Brigantine, New Jersey.  The Stranding Center’s main goal is to rescue, rehabilitate, and release stranded marine mammals and sea turtles.  They are the only marine stranding center in New Jersey.  Since 1978, the Marine Mammal Stranding Center has rescued more than 3,500 whales, dolphins, seals, and sea turtles.  Although rehabilitation is costly, over 90% of the animals rehabilitated at the Marine Mammal Stranding Center make a full recovery and are returned to the wild.  As well as dealing with marine animal issues, the Marine Mammal Stranding Center operates a Sea Life Museum, houses an educational facility which includes hands-on exhibits, and offers marine ecology-based educational programs.  The Stranding Center also offers internship programs.

Marine mammal park: A marine mammal park (also known as marine animal park and sometimes oceanarium) is a commercial theme park or aquarium where marine mammals such as dolphins, beluga whales and sea lions are kept within water tanks and displayed to the public in special shows.  A marine mammal park is more elaborate than a dolphinarium, because it also features other marine mammals and offers additional entertainment attractions.  It is thus seen as a combination of a public aquarium and an amusement park.  Marine mammal parks are different from marine parks, which include natural reserves and marine wildlife sanctuaries such as coral reefs, particularly in Australia.

Dugong: The dugong ( , ; "Dugong dugon") is a medium-sized marine mammal.  It is one of four living species of the order Sirenia, which also includes three species of manatees.  It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow ("Hydrodamalis gigas"), was hunted to extinction in the 18th century.  The dugong is the only strictly marine herbivorous mammal.

West Indian manatee: The West Indian manatee ("Trichechus manatus") or "sea cow" is a manatee, and the largest surviving member of the aquatic mammal order Sirenia (which also includes the dugong and the extinct Steller's sea cow).

The Marine Mammal Center: The Marine Mammal Center is a private, non-profit U.S. organization that was established in 1975 for the purpose of rescuing, rehabilitating, and releasing, marine mammals who are injured, ill, or abandoned.  It was founded in Sausalito, California by Lloyd Smalley, Pat Arrigoni, and Paul Maxwell.  Since 1975 they rescued over 20,000 marine mammals.  It also serves as a center for environmental research and education regarding marine mammals, namely cetaceans (whales and dolphins) and pinnipeds (seals, fur seals, and sea lions).  Marine mammal abandonment refers to maternal separation; pups that have been separated from their mother before weaning.  At the center, they receive specialized veterinary care; diagnosed, treated, rehabilitated, and ideally, released back into the wild.  Animals in need of assistance are usually identified by a member of the public who has contacted the center.  These animals represent the following major species: California sea lion, northern elephant seal, Pacific harbor seal, northern fur seal, and the southern sea otter.  On a few occasions, the Marine Mammal Center has taken in Guadeloupe fur seals, Steller sea lions, and bottlenose/Pacific white-sided dolphins.  The only non-mammals that the center takes in are sea turtles.

Supporting paragraphs: Sea Cow Island Dugong
Answer: Sea Cow Island