Perhaps made popular from the 2008 Seth Rogen movie "Pinapple Express". Although this strain is not the same strain in the slapstick comedy film, in fact Seth Rogen claims he just "made it up".
The first Pineapple pheno was first discovered in the Brosthers Grimm "Cinderella 99" strain. Pineapple Chunk is a cross of Cinderella 99 and Deep Chunk. Most Pineapple named strains contain Cinderella 99. C-99 is a highly sought after strain, however it is seemly getting harder and harder to find. Flying Dutchmans "Pineapple Punch" has the "Real Mc Coy" strain crossed in it, which is basically a recreation of Cinderella 99 by Flying Dutchman.