John 6:71

Using the knowledge brought by subsequent events John explains that Judas was meant, ἔλεγε δὲ τὸν Ἰούδαν Σίμωνος Ἰσκαριώτην [better Ἰσκαριώτου, which shows that the father of Judas was also known as Iscariot], ἔλεγε with the accusative, meaning “He spoke of,” is classical, and see Mark 14:71. The word “Iscariot” is generally supposed to be equivalent to אִישׁ קְרִיּו ̇ ת, Ish Keriyoth, a man of Kerioth in the tribe of Judah (Joshua 15:25). Cf. Ishtob, a man of Tob (Joseph., Ant., vii. 6, 1, quoted in Smith's Dict.). The name Judas now needs no added surname.