What is "siwanoy"

The Native American Siwanoy or Sinawoy were a band of Algonquian-speaking people, in what is now the New York City area. By the mid-17th century, when their territory became hotly contested between Dutch and English colonial interests, the Siwanoy were settled along the East River and Long Island Sound between Hell Gate and Norwalk, Connecticut, a territory that included eastern parts of what became the Bronx and Westchester County in New York and southwestern Fairfield County in Connecticut.