The surname "Whiteside" is of English origin, typically derived from a geographical location. It is believed to refer to someone who lived near a white-sided hill or a place characterized by white cliffs. The name is most commonly found in the northern regions of England, particularly in Cumbria and Yorkshire. Whiteside is also associated with various notable individuals and places. For instance, William Whiteside was a prominent figure in the field of mathematics, while several locations in England bear the name, reflecting the surname's geographical roots.