Below are the sources that show the many Ibo people from Nigeria were transported to Virginia/Maryland ports. Africans from the Bight of Biafra region composed of the greatest number of enslaved Africans transported to VA. I believe their percentage was around 40%. The Bight of Biafra region encompassed present-day Nigeria, Cameroon, Equatorial Guinea, and Gabon. And of those 40%, the Ibo people of Nigeria were in great numbers.
Gwendolyn Midlo Hall, Slavery and African Ethnicities in the Americas: Restoring the Links (Chapel Hill: University of North Carolina Press, 2005), page 138.
Michael A. Gomez, Exchanging Our Country Marks: The Transformation of African Identities in the Colonial and Antebellum South (Chapel Hill: University of North Carolina Press, 1998).