Yes. If you request api.php?action=query&meta=userinfo&uiprop=realname and get no 'realname' property back in the response, 'realname' is a hidden preference.

On Fri, May 10, 2013 at 7:38 AM, Adrián Chaves Fernández <adriyetichaves@gmail.com> wrote:

Is it possible to check through the MediaWiki API (or another non-interactive way) whether real names are enabled or not (http://www.mediawiki.org/wiki/Manual:$wgHiddenPrefs) in a MediaWiki site?

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