My comments on the three possibilities so far:
: I like the "mocked" part the most, but when I think "moniker" I rarely think a name that he choose. Most of the time it's used it's a nickname chosen by someone else. But it still has my vote.
: I like the zippiness, and it makes it clear it's about a chosen name, but doesn't specify in-universe derision and it makes it sound too specific.
: Alias works, but it's ambiguous as to whether it's atrocious because it's an Unfortunate Name
or something incredibly noticeable. Also, like Suckyname Man
, doesn't specify anything in-universe so we'll get people adding names they don't like.