In Senegal's Wolof country, especially the northern regions of Kajoor and Jolof, the Tijānī Order was spread primarily by El-Hajj Malick Sy (spelled "El-Hadji Malick Sy" in French, "Allaaji Maalig Si" in Wolof), born in 1855 near Dagana.
The branch founded by Abdoulaye Niass's son, Al-Hadj Ibrahima Niass (Allaaji Ibrayima Ñas, often called "Baye" or "Baay", which is "father" in Wolof), in the Kaolack suburb of Medina Baye in 1930, has become by far the largest and most visible Tijānī branch around the world today.