Judas and Anti-Semitism
Some scholars of the New Testament suggest that the name "Judas" was intended as an attack on the Judaeans or on the Judaean religious establishment held responsible for executing Christ. The English word "Jew" is derived from the Latin Judaeus, which, like the Greek Ιουδαίος (Ioudaios), could also mean "Judaean". In the Gospel of John, the original writer or a later editor may have tried to draw a parallel between Judas, Judaea, and the Judaeans (or Jews) in verses 6-70-7:1, which run like this in the King James Bible:
6-70 Jesus answered them, Have not I chosen you twelve, and one of you is a devil? 6-71 He spoke of Judas Iscariot the son of Simon: for he it was that should betray him, being one of the twelve. 7:1 After these things Jesus walked in Galilee: for he would not walk in Jewry, because the Jews sought to kill him.
In Greek, the earliest extant language of the Gospels, the words Judas -- Jewry -- Jews run like this: Ιούδας (Ioudas) -- Ιουδαία (Ioudaia) -- Ιουδαίοι (Ioudaioi). In Latin, the language of the Catholic Vulgate Bible, they run Judas -- Judaea -- Judaei. Whatever the original intentions of the original writers or editors of the Gospel of John, however, there is little doubt that the similarity between the name "Judas" and the words for "Jew" in various European languages has contributed powerfully to anti-Semitism. In German the same words run Judas -- Judäa -- Juden; in Spanish Judas -- Judea -- judíos; and in French Judas -- Judée -- juifs.
Over time Judas came to be seen as the archetypal Jew. He was said to have red hair, which was proverbially called "Judas-colored", and the ancient stereotype of Jews was that they had red hair too: in Shakespeare's The Merchant of Venice the Jewish money-lender Shylock is said to have been portrayed with red hair on the Elizabethan stage. Judas's betrayal of Christ for money was also seen as a typical piece of Jewish venality and avarice.
A few modern critics of European culture assert that in paintings and art of the Middle Ages and Renaissance, while the other apostles are portrayed as powerfully built Northern Europeans, Judas was given stereotypically Jewish characteristics. Specific examples of such portrayals in the Middle Ages and Renaissance, however, are hard to come by.
A more modern example, however, can be found in John Fiester's monument clock, the Apostolic Clock. Judas is half the height of the other eleven apostles, hunched over, and possesses an exaggerated nose. The notes provided at the Hershey Museum, where it is on display, claims the artist made Judas shorter because he considered him to be less of a man than the other apostles, not because of anti-Semitism.
http://en.wikipedia.org/wiki/Judas_Iscariot