By default, the name of the app is same as PRODUCT_NAME, which in return is the project name (the root-folder name of your app). EXECUTABLE_NAME is the name of the .ipa file that is generated. I would recommend to leave these two alone, the way they are :)
You can add the following to the Info.plist in order to set your own name:
<key>CFBundleDisplayName</key>
<string>My App</string>
UPDATE: If you need to fetch values from the Info.plist file, you can do it like this:
var utils = require("utils/utils");
var mainBundle = utils.ios.getter(NSBundle, NSBundle.mainBundle);
var appName = mainBundle.infoDictionary.objectForKey("CFBundleDisplayName"));