I will still guess on a very large Suriname. With a population mix of decendants from, Portuguese, West Africans, Indians, Indonesians and Europeans (Portuguese Jews, French Hugenots, Flemish, Germans from the Rhein area, and Dutch)
Critical eara would be the 17th century, but with a good gouvernor as Maurice of Nassau Siegen, and a peace deal with Portugal, the colony have to be consolidated. The border would probably the river Sao Francesco. North would be Dutch, South portuguese. All teritories to the West will be a determined by expeditions in later centuries.
Street language would be a kind of Surinam, mixed with Jewish, Portugues, West African languages and Dutch and some English and the official language and lingua franca would be Dutch, as OTL Suriname.
That Dutch would be the common language should be a development started in later 18th and 19th centuries. Perhaps by a scholar program set up by Misionars or Evangelists?