An alternate name someone uses, or others use, to refer to that person instead of using that person’s real or complete name; another name a person goes by.
Etymology: In Middle English the word was ekename (from the verb to eke, "enlarge"; compare Swedish öknamn). Later, an ekename developed into a nickname when the "n" shifted through junctural metanalysis.
In Viking societies, many people had nicknames heiti, viðrnefni or uppnefi which were used in addition to, or instead of their family names. In some circumstances the giving of a nickname had a special status in Viking society in that it created a relationship between the name maker and the recipient of the nickname, to the extent that the creation of a nickname also often entailed a formal ceremony and an exchange of gifts.