Msg#: 4630925 posted 3:23 am on Dec 16, 2013 (gmt 0)
assuming you are on apache and don't have access to the server config file, you probably want something like this in your .htaccess file of the root directory: RewriteRule ^blog/(.*)$ http://example.com/newname/$1 [R=301,L]
however, where you put this directive and whether it is correct as is depends on what else you have going on in your configuration and where.
there may be a WP plugin that would handle these external redirects for you. if you need more Apache mod_rewrite help, you should post your relevant directives there for discussion.