As I recall, the Ibo were the folks who tried to break free of Nigeria in the 1970s and form their own nation of Biafra. The predominantly Muslim Nigerian army crushed the attempt with horrific slaughter inflicted upon the Animist and Christian Ibo.
I bet nobody told junior that part.
Speaking of DNA tests for this, I thought it only traced the paternal side, but this article said maternal/Ibo.