Mark 6:24

John : a son of Zebedee; younger brother of James; the beloved disciple of Christ,a relative of Annas the high priest,a son of Mary the sister of Barnabas, and surnamed Mark,the father of Simon Peter

Mark 10:51

Rabbi : a title given to teachers and others of an exalted position

Rabboni : a title given to teachers and others of an exalted position