Moniker: Slang for a personal name or pseudonym.
The origins of moniker are murky. According to one theory, it originated in Shelta, the cant (secret) language of Irish itinerants (or Travellers). One characteristic of Shelta is its inversion of syllables; for example, colleen ("girl") becomes lackeen. (Contemporary French slang has this characteristic, too: tango becomes gotan; the woman's name Solange becomes Losange.) Thus Shelta munik ("name") is an inversion of Irish Gaelic ainm, which is related to Indo-European nomen.
When spelled monicker, the term refers to a professional clown's stage name, which is linked to the character of the clown (and not to that of the performer).
Moniker has a specialized meaning in computing jargon; it refers to a COM object (from Component Object Model, a Microsoft software architecture) that is used to create instances of other objects. According to WhatIs.com, "A moniker is an object (or component) in Microsoft's Component Object Model (com) that refers to a specific
Moniker.com is an Internet domain registry.