Customize the `grunt install` command's drush site-install line for your project

install.js

/**
 * Customized site install routine.
 *
 * Used as part of grunt install.
 *
 * Place this file wherever custom grunt-drupal-tasks plugins are loaded, such as bin/grunt for an Outrigger Drupal project.
 */
module.exports = function(grunt) {

  // Modify the drush site-install component of the routine.
  var config = grunt.config.get('drush.install');
  config.args.push('--site-name="Project Name"');
  grunt.config.set('drush.install', config);

}