Jewish and Nerdy

Jews are, perhaps, the originators of the modern Nerd stereotype. Why? Maybe their long, scholarly tradition, maybe their immigrant past (comparable to Asian and Nerdy and the Bollywood Nerd), maybe their overbearing Education Mamas, maybe for some other weird reason. But for whatever reason, you will rarely see a stupid Jew on TV (unless they're more of a Ditzy Genius or Genius Ditz).

Compare Asian and Nerdy and Bollywood Nerd, two other ethnic nerd stereotypes; and Hollywood Nerd for the general appearance. Contrast Matzo Fever and Black and Nerdy, which is an inversion of a more prevalent ethnic stereotype. Intelligence as a character trait may lead to instances of Ambiguously Jewish, thanks to this trope.

Anime and Manga

 * Benny from Black Lagoon is Jewish and a computer geek.

Comic Books

 * Billy/Wiccan from Young Avengers. In a team where every member is some degree of Ascended Fanboy, he's still one of the biggest nerds, and goes from Ambiguously Jewish to canonically Jewish during The Children's Crusade.
 * Gert from Runaways
 * Kitty Pride from X-Men; in the comic she wears a Star of David necklace.

Film

 * Jessica Stein, from Kissing Jessica Stein, is a huge literature and grammar nerd, and is attracted to another character after hearing them use the word "marinate" as a verb.
 * Insert Woody Allen or Jeff Goldblum character here.
 * Mark Zuckerberg in The Social Network (and real life too, of course)
 * Rosenberg and Goldstein - Harold and Kumar's neighbors.
 * While Egon Spengler from Ghostbusters (and its various Spin Offs) is only Ambiguously Jewish, he's a stellar example of the trope.
 * The title character in Barton Fink is a particularly tormented example.

Literature

 * Butters from The Dresden Files is also a total geek and mentions in Dead Beat that he is Jewish.
 * Everybody in The Chosen.
 * Simon Lewis from The Mortal Instruments.

Live Action TV

 * Howard Wolowitz from The Big Bang Theory.
 * Willow Rosenberg from Buffy the Vampire Slayer.
 * Rachel Berry from Glee is a musical theatre nerd, though the show also has a rare stupid (or at least Book Dumb) Jewish character in Jerk Jock Puck.
 * And then, of course, there's Jacob Ben Israel.
 * Seth Cohen from The OC.
 * Ross Geller from Friends.
 * Annie Edison from Community.
 * Barbara Brownstein from The Suite Life of Zack and Cody, a Twofer Token Minority who is also Asian and Nerdy.

Theatre

 * Mark Cohen from Rent.

Video Games

 * The entire Emmerich family line from the Metal Gear series, but Otacon most of all.

Western Animation

 * South Park: Both Kyle and his cousin from New York, also named Kyle.
 * Keep in mind that Kyle Broflovski tries hard to avert this trope and detests his cousin being this stereotype in every way. He's very intelligent, but decidedly less nerdy than most versions of this trope.
 * Mort Goldman, his wife Muriel, and their son Neil from Family Guy all fit this trope to a T.
 * Snot from American Dad
 * Ron Stoppable from Kim Possible.
 * Sheldon Klutzberry from The Replacements.

Real Life

 * Logan Lerman.
 * Albert Einstein.
 * As mentioned in the "Film" section, Mark Zuckerberg, the founder of Facebook.
 * Eddie Deezen might well be the Trope Codifier, at least for younger viewers.
 * Pee-Wee Herman (Paul Reubens had an Israeli father.)
 * Andrew Garfield
 * Seth Green
 * Rick Moranis (a Canadian-Jew)
 * Maggie Gyllenhaal and Jake Gyllenhaal are both often mentioned in discussions about "nerd chic", and are practically the poster children for both Nerds Are Sexy and Matzo Fever.
 * Leelee Sobieski
 * Noam Chomsky
 * Pennant-winning MLB general managers Jon Daniels, Theo Epstein and Andrew Friedman.
 * Mayim Bialik (yes, the girl from Blossom. She's a neuroscientist now!)