You may want context for your analysis of an ethnographic work. The sources listed on this page include demographic, economic, culutral, and historical information. For more a more in-depth history, please search Primo.
The Ethnonym index helps you identify alternate names of ethnic groups. For example, when I looked up Ashante (one of your possible topics) I discovered that the Ashante are also referred to as the Akan, Asante, Akuapem, Akwamu, and Akyem.