Martin Waldseemuller's Cosmographiae Introductio is the first to call the New World America.
Citation:
Editors. "World map names America after Amerigo Vespucci".
The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=9872, accessed 19 May 2013.]