despite these being used by many tribes and ethnic groups , hey are really Loikop (Samburu) spears, very common, alongside the more typical Masai Lion spears.
https://en.wikipedia.org/wiki/Loikop_people
https://www.jstor.org/stable/124620
They are very common among the many tourists which flood Kenya and bring them back.
http://www.vikingsword.com/vb/showthread.php?t=21630