The name Kofi is a boy's name of African, Ghanan, Ghanaian origin meaning "born on Friday". Kofi and is often added to lists like Unique Boy Names: Unusual and Rare and discussed in our forums with posts like "Picky Parents BNG".
From the experts:
This Akan day name is very much associated with Ghanan Kofi Annan, the seventh secretary general of the United Nations. 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. Kofi is the male name for babies born on a Friday (the female variant is Afua/Efua).