I have never seen anyone else growing Zac Purple myself. Lots of people sell it as Big Sur Holy Weed, a derisive of Zacatecas Purple, but to date what was sold as BSHW has always turned out to be some dubious line, or more commonly a strain of SAGE, a later indica cross with BSHW which is more common. The name SAGE was dubbed locally in the coastal Santa Lucia Mountains where it was bred as being the Sativa Afghani Genetic Equilibrium. Sage is commonly mis-quoted as being a cross of Haze and Afghani, but it is definitely not a Haze cross. Zac Purple was in Big Sur in the 1960s long before Haze was bred, if Haze was bred in California at all. Big Sur Holy was more of a joke name locally. The name was later penned by Jerry Kamstra in the book, Weed published in 1972/3. Lots of stories about who brought Zac Purple to Big Sur, and they are mostly stories. Zac Purple was grown in the Big Sur area for about a decade though, in small plots as seeded standard weed. It was just called Big Sur Purple in the later 1970s and in the early 1980s it was grown as sinsemilla. Then it was displaced locally by SAGE and indica hybrids.
