How can I determine whether I can use a name commercially?
<p>Where can I search for whether I can or cannot use the name "Connect 4" or "Connect four" for my game?</p>

<p>In the United States <a href="http://www.uspto.gov/trademarks-application-process/search-trademark-database" rel="nofollow">you can search trademarks at the U.S. Patent and Trademark Office (USPTO) website</a>.</p>

<p><a href="http://www.uspto.gov/trademarks-application-process/search-trademark-database" rel="nofollow">http://www.uspto.gov/trademarks-application-process/search-trademark-database</a></p>

<p>In the UK you can use the <a href="https://www.gov.uk/search-for-trademark" rel="nofollow">Intellectual Property Office</a>'s website to search for trademarks.</p>

copyright trademark