Originally known as Walker's Kilmarnock Whisky, the Johnnie Walker brand is a legacy left by John "Johnnie" Walker after he started to sell whisky in his grocer's shop in Ayrshire, Scotland. The brand became popular, but after Walker's death in 1857 it was his son Alexander Walker and grandson Alexander Walker II who were largely responsible for establishing the whisky as a popular brand. Under John Walker, whisky sales represented eight percent of the firm's income; by the time Alexander was ready to pass on the company to his own sons, that figure had increased to between 90 and 95 percent.
In Britain prior to 1860, it was illegal to sell blended whisky. During that time John Walker sold a number of whiskies--notably his own Walker's Kilmarnock. In 1865, John's son Alexander produced their first blend, Walker's Old Highland.
Alexander Walker introduced the iconic square bottle in 1860. This meant more bottles fitting the same space and resulted in fewer broken bottles. The other identifying characteristic of the Johnnie Walker bottle is the label, which is applied at an angle of 24 degrees and allows text to be made larger and more visible.