A patronymic surname-name meaning son of Alexander.
Sanderson is an English patronymic surname meaning "son of Sander" — Sander being a medieval short form of Alexander, the great Macedonian-Greek name meaning "defender of men" (from alexein, to defend, and aner, man). Alexander was one of the most widely adopted names in medieval Europe following the fame of Alexander the Great and the popularity of several early Christian saints of that name.
As surnames crystallized in the thirteenth and fourteenth centuries, the sons of men called Sander took the family name Sanderson, which spread throughout northern England and Scotland. As a given first name, Sanderson represents the well-established fashion of using distinguished English surnames as forenames — a practice with roots in aristocratic naming customs where maternal family surnames were passed forward to sons as a mark of lineage and inheritance. Today the name carries a certain bookish prestige, due in no small part to the phenomenal success of fantasy author Brandon Sanderson, whose Cosmere universe has made him one of the best-selling and most beloved writers of his generation.
For readers of speculative fiction, the name resonates with extraordinary worldbuilding, prolific creativity, and genuine kindness toward the fan community. Sanderson as a given name feels both rooted in English heritage and brightened by a contemporary literary glow.