A distinct Creole culture called the Ilois, which means "islanders" in French Creole, evolved from these workers. The Ilois, now called Chagos Islanders or Chagossians since the late-1990s, were descended primarily from slaves brought to the island from Madagascar by the French between 1793 and 1810, and Malay slaves from the slave market on Pulo Nyas, an island off the northwest coast of Sumatra, from around 1820 until the slave trade ended following the Slavery Abolition Act of 1833. The Ilois also evolved a French-based Creole dialect now called Chagossian Creole.