Ba Yombe refers to people among the tumbuka

Tumbuka

The Tumbuka are a Bantu ethnic group living in Northern Malawi, Eastern Zambia and Southern Tanzania. Their chief god is called Chiuta, who is all-powerful, omniscient and self-created, just like the God of the Abrahamic religions...

 of Zambia

Zambia

Zambia , officially the Republic of Zambia, is a landlocked country in Southern Africa. The neighbouring countries are the Democratic Republic of the Congo to the north, Tanzania to the north-east, Malawi to the east, Mozambique, Zimbabwe, Botswana and Namibia to the south, and Angola to the west....

 who speak a dialect

Dialect

The term dialect is used in two distinct ways, even by linguists. One usage refers to a variety of a language that is a characteristic of a particular group of the language's speakers. The term is applied most often to regional speech patterns, but a dialect may also be defined by other factors,...

 called chi Yombe. Chief Muyombe is their leader and they have Vinkhakanimba for their annual traditional ceremony. The area they live in is geographically counted as part of the Northern Province of Zambia though linguistically they are closer to the Eastern Province languages. They live on the plateau.