Joof (English spelling in the Gambia) or Diouf (French spelling in Senegal and Mauritania) is a surname that is typically Serer. This surname is also spelt Juuf or Juf (in the Serer language). They are the same people. The differences in spelling is because Senegal was colonized by France, while the Gambia was colonized by the United Kingdom. Although spelt differently, they are pronounced the same way.