“A sobriquet is a nickname or a fancy name, usually a familiar name given by others as distinct from a pseudonym assumed as a disguise, but a nickname which is familiar enough such that it can be used in place of a real name without the need of explanation. This salient characteristic, that is, of sufficient familiarity, is most easily noted in cases where the sobriquet becomes more familiar than the original name for which it was formed as an alternative. For example, Genghis Khan, who is rarely recognized now by his original name “Temüjin”; and the British Whig party, which acquired its sobriquet from the British Tory Party as an insult.” —Wikipedia - Sobriquet
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