functions.php

// Adds a filter to form id 7. Replace 7 with your actual form id
add_filter('gform_pre_render_7', 'eo_form_pre_render');

function eo_form_pre_render($form)
{
  // if no user is logged-in, do nothing
  if ( !is_user_logged_in() )
    return $form;
  
  foreach ($form['fields'] as &$field)
  {
    // replace 2 with the actual ID of your Name field 
    if ( 2 == $field['id'] )
    {
      eo_populate_name_field($field, array(
        'first' => eo_get_usermeta('first_name'),
        'last'  => eo_get_usermeta('last_name'),
      ));
      break;
    }
  }
  
  return $form;
}