Where does “kamsepuka” come from?

kamsepuka (Tumbuka) comes from Tumbuka ka-, from Taos ká-.

Ancestry of “kamsepuka”, step by step

Step	Language	Word	Meaning
1	Tumbuka	ka-	Class 12 noun prefix, used with a diminutive or depreciative meaning
2	Taos	ká-	—