Crispin, which was introduced into the mainstream by actor Crispin Glover and which means "curly-haired" in Latin, has an image very much like its first syllable: crisp, autumnal, and colorful.
St. Crispin, the patron saint of shoemakers, died in the third century and, as rousingly referenced by Shakespeare, Henry V fought a great battle on St. Crispin's Day. Crispin Glover was actually named for the Shakespearean speech.
In the Harry Potter books, Crispin Cronk is an egyptophile wizard who kept several sphinxes in his backyard.
Crispian is an interesting, rarely used variation, as is Crispus, associated with African-American hero Crispus Atticus, the first colonist to die for independence in the Boston Massacre.