Why was "Vanilla Ice" localized as "Cool Ice"? In the Stardust Crusaders series, the antagonist Vanilla Ice is localized into English as "Cool Ice". There's also the renaming of Steely Dan to "Dan of Steel". Is it due to possible copyright/trademark infringements? Or is there another reason, artistic license?
I found a page from the US Government's Patent and Trademark Office that explains when a musician can trademark a name. http://www.uspto.gov/learning-and-resources/ip-policy/musicians-and-artists-profile, under Registering a Name:


  Sometimes musicians and artists want to register their name as a
  trademark, including a stage name or pseudonym. If the mark appears to
  be a person’s name, then there are additional requirements for the
  application. If the name is an actual name (including a nickname or
  stage name) of any living individual, then the person’s consent to the
  use and registration of the name must be included in the application
  file. See TMEP 813 &amp; 1206.03. If the mark does not refer to a living
  individual, but could be interpreted as a name (e.g., a band name that
  looks like a person’s name), then a statement that the mark is not a
  living individual must be in the application file. See TMEP 813.01(b).
  In addition to the consent requirement, applications seeking to
  register a performer’s name as a trademark must include evidence that
  the mark appears on at least two different works (e.g., multiple CD
  covers). See TMEP 1202.09(a).  Applications seeking to register a name
  as a service mark must show a use in connection with the service, and
  not merely the artist’s name or the name of the group. See TMEP
  1301.02(b).  However, an artist’s name or pseudonym affixed to an original work of art (sculptures, paintings, jewelry), need not show
  use in connection with a series. See TMEP 1202.09(b).


I couldn't find any specific source saying that Vanilla Ice and Steely Dan were trademarked, but it seems likely they are. (So we should really write Vanilla Ice&trade; and Steely Dan&trade;.) The names have appeared on several CD covers, so that clause is covered; and it seems unlikely that the actual name of any living person is "Vanilla Ice" or "Steely Dan". (But even if there was a "Vanilla Thaddeus Ice" living in Gary, Indiana, the kind of money that a major record label used to be able to command could probably convince him to give permission for the trademark.)

The US fair use laws do list parodies as a protected class of work, so according to what little I know of Jojo's Bizarre Adventure and fair use law, it could probably be argued in court that this is a parody and therefore a protected usage. But I imagine the translators wanted to avoid any risk of going to court to argue about this, so they voluntarily changed the names.