Trademark legislation is complex, but generally:
- a name cannot be copyrighted, but can be protected as a trademark, whether used as a design or not
- logos are generally protected under trademark legislation (check for the ® or ™ symbols)
- don't use someone else's trademark in a way which would allow you to profit from the logo, or to confuse you with the real owner
- you may use marks and logos to criticise or parody the trademark owner, as long as it is clear you aren't the real owner
- remember that many cartoon characters are protected as trademarks.