E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
At one time a district of public gardens much frequented on holidays. According to tradition, it received its name from Ben Pimlico, famous for his nut-brown ale. His tea-gardens, however, were near Hoxton, and the road to them was termed Pimlico Path, so that what is now called Pimlico was so named from the popularity of the Hoxton resort.
Have at thee, then, my merrie boyes, and beg for old Ben Pimlicos nut-brown ale.Newes from Hogsdon (1598).