The story
The firm was started in 1701 by Tempest Slinger and his nephew, also named Tempest Slinger. In 1759, Oliver Farrer joined the firm, becoming a partner and the sole proprietor by 1769, and the name Farrer was added to the firm's name. From then until 1999, there was always at least one Farrer, and often several, working at the firm.
From Wikipedia’s article on Farrer & Co, shared under CC BY-SA 4.0.4