The General Epistle of Jude, often shortened to Jude, takes its title from the book in which the author identifies himself as Jude the “brother of James”.  The gospels record Jesus’ brothers as James and Judas but English versions typically shorten the name to “Jude” to avoid comparison to Judas Iscariot, the disciple who betrayed Jesus.  The book is difficult to date but generally believed to have been written between 67 AD and 80 AD.