The word “Viking” probably comes from the Old Norse word vik (creek) and seems to mean “men of the creeks,” or sea warriors from the inlets and bays of Scandinavia.

Vikings were Norse seafarers, mainly speaking the Old Norse language, who raided and traded from their Northern European homelands across wide areas of northern, central and eastern Europe, during the late 8th to late 11th centuries. The term is also commonly extended in modern English and other vernaculars to the inhabitants of Viking home communities during what has become known as the Viking Age.

Source: https://en.wikipedia.org/wiki/Vikings