The meeting between Fulgentius and Abragil took place at the court of the Vandal King Thrasamund between the exiles of Fulgentius to Sardinia. I assume that Abragil was Arian because of the context: the precedent interlocutor of Fulgentius was an Arian bishop, and the general setting is the debate in front of the king, in which Fulgentius was expected to present the Catholic doctrine. Abragil does not seem to be a Germanic name, and of course it is not Latin, so it may have indigenous African origins.