A group of these Native Americans were, in deeds and correspondence, known as the Sepasco Indians, a name specific to Native Americans in the Sepasco area (modern-day Rhinebeck). The word "Sepasco" probably originated from the tribe's word for little river or stream, "sepuus", which is believed to have referred to the Landsman Kill. By 1685, a trail known as the Sepasco Trail was formed by them and was routed from the Hudson River, eastward through the present-day Village of Rhinebeck, ending at Lake Sepasco. The trail from the Village of Rhinebeck to Lake Sepasco follows roughly modern-day NY 308, in some areas slightly to the south, where the highway's side roads are curved in a pattern similar to that of the Sepasco Trail. It is possible that the trail as a whole existed as a spur of an ancient path that stretched from Rhinebeck to today's Cornwall, Connecticut.