Usumbura was renamed Bujumbura when Burundi became independent in 1962.    From Wordnet, Princeton University. 

Usumbura, governed by Simveh, ally and friend of Warumashanya, extending to the eastern bank of the Rusizi. 4th.    From Wordnik.com.  [How I Found Livingstone] Reference

Had we continued along the eastern shore, and so round the northern side of the lake, we should have passed by Mukanigi, the country of Warumashanya, and Usumbura of.    From Wordnik.com.  [How I Found Livingstone] Reference

I had to sit idle in Usumbura or Ujiji, or else come away; and idleness ill suits my blood!.    From Wordnik.com.  [The Ivory Trail] Reference

Usumbura, Mukanigi, and Mugere.    From Wordnik.com.  [How I Found Livingstone] Reference