from The American Heritage® Dictionary of the English Language, 5th Edition.
- A river rising in east-central Kansas and flowing about 240 km (150 mi) generally southeast to the Osage River in western Missouri.
Sorry, no etymologies found.
A correspondent writes: The river on which the town is located was named by French explorers, late in the 18th century, Marais des Cygnes.
Iowa, and the name of a beautiful river in Kansas, Marais des Cygnes
KANSAS - Baxter Springs, Lawrence, Marais des Cygnes, Mine Creek.