This is a list of surnames in which the usage is African; and the pattern is *a.
Kenyatta KikuyuFrom
kinyata, the name of a type of ornamental belt worn by the Maasai. This was the surname of the first president of Kenya, Jomo Kenyatta (1897-1978). He adopted the surname in his youth.
Mandela XhosaPossibly from Xhosa
mandla meaning
"district, region". This name was borne by the South African activist and president Nelson Mandela (1918-2013). His family's surname was apparently adopted in the 18th century from an ancestor's given name.
Obama LuoFrom a rare Luo given name meaning
"crooked, bent". It was possibly originally given to a baby who had an arm or leg that looked slightly bent immediately after birth or who was born in the breech position.