13:1 Niger. Simeon was evidently called “Niger” (a Latin word) because of his dark skin. There is a possibility that he was the Simon who carried Jesus’ cross.
13:1 Lucius. Certain ancient texts suggest that Lucius was actually Luke the physician, who wrote the gospel of Luke, and who first met Paul here at Antioch.
13:1 Herod the tetrarch. This Herod was Herod Antipas, who ruled Galilee during Jesus’ ministry.
13:2 the Holy Ghost. Thus the Holy Spirit is clearly a divine Person, not an influence of some kind. When occasion requires (as here), He speaks clearly.