The name of Tik Tok account can be changed at will, as long as the new name does not violate Tik Tok's regulations, does not contain sensitive words and does not affect traffic.
Renaming will not be restricted, but it may affect the account tag after renaming, resulting in different fan groups recommended by the system. Tik Tok's traffic is mainly obtained through push rather than search, so renaming may have little effect on old fans.