There were lots of "Gropecunt Lanes"!

The term "Gropecunt Lane" was a euphemism widely used to describe an area where prostitutes conducted their business, or to descrbe a place where couples went to do what comes naturally ( a sort of impolite version of "Lovers Lane") - i.e it's not a real name, but a nickname that describes what the area was used for :)

Wikipedia has a detailed article on it (link below) - in relation to the area in London it says "The Gropecunt Lane in London was near the present-day site of the Barbican Centre in the City of London. The street was called Grub Street in the 18th century, but renamed Milton Street in 1830."