It is noted that Christopher Columbus could have come from the town Calvi on the island of Corsica, which at the time was part of the Genoese republic. The argument is that if he were Corsican, he would have wanted to hide his origins as the Corsicans had a bad reputation.
There is little widespread evidence that Columbus came from Corsica. I have been unable to read a book which puts forward Columbus' Corsican origins (Corsica: Columbus's Isle, by Joseph Chiari, 1960), the author states that "Don Minendez Pidal, described by Salvador de Madariaga as the chief Spanish philosophical authority whom he specifically consulted, firmly rejected the notion that Columbus's language could be that of a Spanish Jew"
Christopher Columbus - discoverer of America