How to Recover Your Apple ID Name
If you can't remember your Apple ID Name, you can retrieve it by using the iForgot Password Retrieval process. Follow these steps to recover your Apple ID Name:
1) Go to iForgot.apple.com.
2) On the Password Retrieval page, click the link "Forget your Apple ID?" shown below.
3) Complete all the required fields that might be associated with your Apple ID.
NOTE: If multiple email addresses have an Apple ID, select your current or most recently used email address.
4) You'll be presented with 2 options. Choose Option 1 to request an email from Apple, or Option 2 to answer the security question you set up when you first created your Apple ID.
NOTE: You'll proceed as if you're going to reset your Apple ID password.
5) By following the emailed link or answering the security question, you'll be presented the option to reset your Apple ID password. Your Apple ID is shown in red.
See How to Recover Your Apple ID Password if you'd like more information.