Viking is one of the most recognisable words in English, yet it essentially disappeared from the language for seven centuries before being resurrected by 19th-century scholars.
The Old Norse víkingr most likely derives from vík meaning 'inlet' or 'bay'. This makes a viking literally 'a person from the inlet' — someone who lurked in sheltered coves, waiting to strike. The connection between geography and identity is powerful: the indented coastlines of Scandinavia, with their countless fjords and bays, literally shaped the word for their most famous export.
An alternative etymology connects it to Old English wīc meaning 'camp' or 'trading post', from Latin vicus. This would make a viking a 'camp-person' or trader — fitting, since Vikings were as much merchants as raiders.
The word appeared in Old English as wīcing but faded after 1066. For centuries, English speakers called them 'Danes' or 'Norsemen'. The revival came in 1807 when scholars translating Icelandic sagas reintroduced 'viking' — and the Romantic imagination, hungry for noble savages, made it immortal.