I don't have that exact information, but I can tell you about a millennium ago many Toucouleurs in the Senegal River Valley converted to Islam and likely contributed to etymology. 
 Thank you for the information on Senegal. 
 Sure, rivers include the Gambia, Casamance, and Senegal Rivers and the northern border is formed by the Senegal. 
 Do you have any more information on Senegal's geography? 
 Interesting, I love to visit rivers. How about on more fact about Senegal.
Sure, rivers include the Gambia, Casamance, and Senegal Rivers and the northern border is formed by the Senegal.