According to the Cannabible their was a strain called Purple Haze back in the 70's . Apparently it wasn't very good, however, so people stopped groing it and the strain died out.

There does appear to be a new Purple Haze strain, however. Many of San Francisco's medical-marijuana cannabis clubs sell it. These places are pretty legit and offer lots of different strains so it's not like it's just some dealer giving his weed a fancy name to jack up the price. From what I understand it is not a Haze at all but a cross of Purple#1 and something else.