Comment out in qa-app-format.php:
function qa_set_up_name_field(&$qa_content, &$fields, $inname, $fieldprefix='')
/*
Set up $qa_content and add to $fields to allow the user to enter their name for a post if they are not logged in
$inname is from previous submission/validation. Pass $fieldprefix to add a prefix to the form field name used.
*/
{
/*$fields['name']=array(
'label' => qa_lang_html('question/anon_name_label'),
'tags' => 'name="'.$fieldprefix.'name"',
'value' => qa_html($inname),
);*/
}