polyonymy
/ˌpɒlɪˈɒnɪmi/(also polyonomy)
noun
The use of several different names for the same person or thing; variety of names or titles.
Origin
Late 17th century; earliest use found in Ralph Cudworth (1617–1688), philosopher and theologian. From ancient Greek πολυωνυμία a multitude of names from πολυώνυμος + -ία; compare -onymy.