His name is Bakos. He is an Ethiopian eunuch, a court official of the Candace, queen of the Ethiopians. The name wasn't mentioned in the bible but is still famous in the Ethiopian Orthodox Tewahido Church and the church has many reference for this part of the bible and the whole. You can find the story in Acts 8:26. Philip the Apostle taught him and finally baptised him. According to Church Scholars, Bakos is the first person who took the knowledge of Christianity out of the middle East and introduced to the outside world, even before the Apostles did it.