- Car·los Juan [kahr-lohs wahn] /ˈkɑr loʊs wɑn/, 1833–1915, U.S. physician, born in Cuba: first to suggest mosquito as carrier of yellow fever.
- a river in N British Columbia, Canada, flowing SE to join the Parsnip River in forming the Peace River. 250 miles (402 km) long.
- Carlos Juan (ˈkarlos xwan). 1833–1915, Cuban physician: discovered that the mosquito was the vector of yellow fever