There are variants on this drink: any fruit syrup mixed with wine: crème de mures (blackberries), crème de peche (peaches), crème de framboise (raspberry). You can also mix it with red wine 'le communard' or cider 'le kir breton'.
Traditionally this drink comes from Dijon, in fact it's named after Felix Kir, a former mayor of Dijon, and drunk with the dry white wine from that area, Aligoté, a burgundy. I like to keep a tiny bottle in my handbag at all times, for travel or 'emergency' kirs.
Dijon is also well known for mustard, which they sell in ceramic jars. Must have a go at making mustard one of these days.