alias

1a) a form of a person’s personal name also known as an allonym; an a. is usually one of multiple forms which more particularly may be a non-official name; in some cultures, e.g., among certain Native American tribes, people may receive several a. throughout life, but at a given event would use only the one most recently bestowed or the one most appropriate for the circumstances; the interpretive form is a standard a. which gives the English interpretation of a native name; 1b) among the Oriental cultures there are several aliases; 2) a form of the calendar date; a standard interpretive form of a date is the Julian day number