After looking at the last pictures again, I would revise my opinion (Maasai sword). Too many features look different, e.g. the cord winding of the handle and the old shape of the blade with the lower quality of workmanship that can be found in newer examples.
I therefore think that the sword comes from one of the surrounding tribes who like to adapt Maasai weapons, such as Samburu or Kikuyo.
Here are a few good examples of Maasai swords:
http://www.vikingsword.com/vb/showth...ghlight=maasai