TSE.  An African Ewe name usually given to the second-born of twin brothers.  The first-born twin is named Atsu (q.v.). (Ewe-Speaking Peoples of the Slave Coast of West Africa, Ellis, 1890)

... In the countries westward of the Niger, as well as in Gabun, Loango, etc., the advent of twins is hailed with joy, and religious ceremonies for their protection take place.  Special names are given to them; thus, the Ewes call the first-born of twin brothers Atsu, the second Tse, while the first male child born after twins has to receive the name Dosu.  Some of the Yoruba tribes reverence twins, who are deemed to bring the best of luck to the household and tribe, and the death of one of them is considered a grave misfortune... (Encyclopaedia of Religion and Ethics: Mundas-Phrygians, 1917.