I don't think so; the name isn't editable in the mirror in the homestead that can be used to redo the cosmetic portion of character creation.
You might be able to use the
EE pak extractor (latest version
download) to extract the save files, find the current name and hex edit the file to change it. Even if that worked, though, it would produce a 'tampering or corruption' warning whenever the save (or subsequent ones from that point) was loaded.