Hm, I don't know if these count. But, here goes.
'Cola' or 'Aries': these are parts of my gamertags, pen names, or usernames on various forums. But, since I mostly do voice chats in game, a lot of people will refer to me by one of these, even if they are good friends that know my real name. Sometimes even my husband does it (but he also does video...... reply