shiraz is the name of brand or a city.
have you heard of it?

yes, type of grape, named after city in iran, where it came from: more details below, see link

Shiraz (grape)
Shiraz grapes have a characteristicly deep purple color that is reflected in their wine.Shiraz or Syrah is a variety of grape used in wine. The names are interchangeable. It is called Syrah in France, and most often in the United States, South Africa, Australia, and Canada it is known as Shiraz. In Australia it used to be called Hermitage up to the late 1980s. It should not be confused with Petite Sirah, a synonym for Durif, which is a different type of grape. Its name stems from Shiraz—the city of flowers, wine and poetry in Iran—in the heart of an ancient winemaking region. The grape also has many other synonyms that are used in various parts of the world including Antourenein Noir, Balsamina, Candive, Entournerein, Hignin Noir, Marsanne Noir, Schiras, Sirac, Syra, Syrac, Serine, and Sereine.[1]





Naming
Winemakers (or wine marketers) sometimes choose one name over the other to signify a stylistic difference in the wine they have made. "Syrah" labelled wines are sometimes thought to be more similar to Old World examples (presumably more elegant or restrained) such as Northern Rhône reds. "Shiraz" labelled wines are more similar to New World examples (presumably riper and fruitier), but even this rule of thumb is unevenly applied.[2]


Origin
The name of the grape Shiraz was taken from that of the city of Shiraz in Iran, near where the process of wine making possibly originated 7000 years ago.[3] Historic accounts state that the Syrah/Shiraz was brought into southern France by a returning crusader, Guy De'Sterimberg. He became a hermit and developed a vineyard on a steep hill where he lived in the Rhône River Valley. It became known as the Hermitage. In 1998, a study conducted at the University of California, Davis concluded that the grape variety in its modern cultivated form originated in the vicinity of the Northern Rhône valley of France, as the result of a cross of the "Dureza" and "Mondeuse Blanche" grape varieties;[4] and in 2001, using DNA analysis, this was proven to be the case.

Shiraz is a kind of grape from Australia, just like the "french" syrah.
Fully bodied and a little spicy. I love shiraz. Greg Norman is a good brand.