It has been spelled both ways over the years The oldest charts all tended to spell it Moskito although there are also a number of pretty old chart on public display in the BVI ie in the old Government House museum that refer to it as Mosquito island and modern charts almost all refer to it as Mosquito island I don t know whether the implication is that the word mosquito was just spelled differently in ye olden days Richard Branson has exhibited a preference for referring to it as Moskito island and as the owner his views count for something but it is a bit tricky to say which is correct My own view is that Moskito is probably more correct probably with a redirect from the other spelling but a section on the alternative names is certainly appropriate