Given to the first-born son. Nande (and the closely related Bakonzo of Uganda) name children directly for their birth rank among their siblings. The name itself states the order of birth.
Source: Nande/Bakonzo birth-rank naming system, cross-referenced across Wikipedia (Mumbere), Uganda's Monitor newspaper ("What a name tells you about a Mukonzo"), and an independent Bakonzo-naming blog (Molho Writes)