“Graphic novel” is a weak name. For one thing, it sounds like smut. (“Man, that novel was so…so graphic!”) Besides, it implies that a book-length comic book must be fiction.

And that’s a rotten shame, because nonfiction graphic novels have a huge potential readership. The Zogby polling group just released a new survey on books and reading. It found that the most popular genres after general fiction are nonfiction: history, current events / politics / international affairs, biographies, and religion / philosophy. Library Journal’s 2008 book-buying survey says that the books with the highest circulation are in the medicine/health category. An Associated Press / Ipsos poll says that the most-read books in 2007 were the Bible and other religious works; history and biography were popular, too. Nonfiction sells.

So why does nonfiction account for only two percent of all graphic novels?

I took that figure from Amazon.com, which lists 74,021 graphic novels, of which only 1,573 are nonfiction. Quite a few of them aren’t graphic novels at all but prose nonfiction about comics like Schulz and Peanuts: A Biography and The Ten-Cent Plague: The Great Comic-Book Scare and How it Changed America.

Maybe there are so few nonfiction graphic novels because they don’t sell. Or maybe not.

Rank Amazon’s GNs by sales. You’ll find that the top one percent – in fact, the top one-third of one percent – includes plenty of nonfiction. There’s history and current events like The 9/11 Report and Larry Gonick’s Cartoon History series, and memoirs such as Fun Home, Persepolis, and Maus.

What’s more, Joe Sacco’s work of comics journalism Palestine seems to find new readers every time the Israeli-Palestinian conflict heats up. Scott McCloud’s Understanding Comics is virtually required reading for anyone interested in comics. And Harvey Pekar’s American Splendor became an Oscar-nominated movie.

Publishers for kids know the strength of nonfiction GNs. Capstone Press’ Graphic Library series has dozens them, covering history, biography, and science (including – cough, cough – my own Samuel Morse and the Telegraph). Lerner Publications has its Graphic Universe line, Rosen Publishing has Graphic Nonfiction, the British publisher Osprey’s Graphic History imprint focuses on wars and battles, and Gossamer Books publishes nothing but nonfiction graphic novels.

But where are the graphic-novel equivalents or adaptations of the nonfiction that adults buy? It’s hard to find comics versions of spiritual and self-help books like The Purpose-Driven Life, The Secret, The Last Lecture, and A New Earth. There aren’t many political manifestoes like Barack Obama’s The Audacity of Hope and Ron Paul’s The Revolution. There’s a shortage of GNs full of advice along the lines of Rich Dad, Poor Dad, or Men are from Mars, Women are from Venus. And where are the GN editions of food books like The South Beach Diet? As my retailer friends say, we’re leaving money on the table.

If publishers start generating graphic novels for grown-ups in a variety of nonfiction genres, will retailers and librarians stock them? Maybe not immediately, but I think it’ll happen. I can imagine publishers producing floods of squarebound comic books full of happy-talk spirituality, oversimplified investment counseling, rants about government, and hardnosed commands about how to eat, behave, feel, think, and live.

Say, publishers? Take your time, okay?