a quick google search could have told you
Society-WOLOF
The Wolof constitute a large ethnic group located mainly in the western
part of the former French West African colony of Senegal, and extending
southward into The Gambia--a former British colony. Wolof (Ouolof
in the standard French orthography) is the name by which the people
refer to themselves, and the label commonly used in scholarly publications.
But a large number of orthographic variants occur in the literature,
ranging from Chelofes, Guiolof, and Iolof, to Joloffs, Valaf, and
Yuloff.
The indigenous language is also called Wolof. It is classified within
the Northern Branch of the West Atlantic subfamily of the Niger-Congo
language family. The most closely related languages are Serer and
Fulbe (Fulani) (Greenberg 1966: 7-8, 25; Voegelin 1977: 28-29). The
Lebu, a separate ethnic group centered in the Cap Vert peninsula of
Senegal, speak a distinct Wolof dialect. The Wolof language is rapidly
becoming the national vernacular of Senegal. Members of other ethnic
groups are increasingly learning Wolof as a second language, especially
in the urban areas. It was recently estimated that 80 percent of Senegalese
speak Wolof