The name Akosua is a girl's name of African, Ghanan, Ghanaian origin meaning "Born on a Sunday".
Akosua means "born on a Sunday," which relates the name to the sun and thus to fire.
The Akan people of Ghana and the Ivory Coast frequently name their children after the day of the week they were born and the order in which they were born. Most Ghanans have a name using this system (think Kofi Annan, whose name means born on a Friday).
Akosua is the name for girls born on a Sunday. The name for boys born on a Sunday is Kwasi.