Am very happy to talk about this topic
before I go further let me take you the old relationship between the Hausa's and Yoruba's, before the Hausa use the word Yorubawana to call we in the western part of Nigeria before advent of British, with trade interaction we from western area also call north Hausa due to their product they sell called awusa or asala ,since then we've both been calling each other that name Hausa or Yoruba.