I always thought the word denim and jeans comes from English, and American English at that. I mean, Levis where the first to make them, but, I was wrong. According to Wikipedia, the word denim comes from the name of a sturdy fabric called serge, originally made in Nîmes, France, by the Andre family. Originally called serge de Nîmes, the name was soon shortened to denim. Denim was traditionally coloured blue with indigo dye to make blue "jeans," though "jean" then denoted a different, lighter cotton textile; the contemporary use of jean comes from the French word for Genoa, Italy (Gênes), where the first denim trousers were made."