Kossi is a masculine given name used among the Ewe people of Ghana and Togo, functioning as the Ewe form of Kwasi. The name is part of a widespread West African tradition of day-naming, in which a child is given a name corresponding to the day of the week on which they were born. Kwasi itself is an Akan name meaning “born on Sunday”, and Kossi is its Ewe equivalent, maintaining both the day association and the phonological pattern characteristic of the Ewe language, where initial /k/ often remains unaltered or shifts slightly. Among the Akan, other related day-names for males born on Sunday include Kwesi, which shares the same root. While Kwasi and Kwesi are widely documented in Akan culture, Kossi specifically belongs to the Ewe ethnolinguistic group. In both linguistic traditions, day-names are deeply tied to social identity: they encode spiritual attributes associated with the day of birth, such as the soul's character or destiny. In Akan cosmology, Sunday-born children are traditionally believed to be courageous and ambitious—traits connected to the sun's vital energy—and this symbolism carries over into the Ewe adaptation. It is worth noting that the name also appears historically in other contexts. According to records from colonial accounts (Baptist Missionary Magazine, Vol. 73), Kossi was used by Beninese captives in the 19th century, likely Ewe-speaking individuals from the Dahomey region, who carried the name as part of their day-naming custom into the African diaspora. The lexicographic entry on Wiktionary further documents Kossi as a Finnish surname, with a variant of Kossila, demonstrating independent derivation and unrelated usage. According to Digital and Population Data Services Agency of Finland data (August 2025), the surname Kossi belongs to 135 individuals in Finland. These latter occurrences, however, are distinct from the West African given name in terms of origin and meaning.