Justin beiber is an american artist and singer. He has been involved in numerous controversies. His email ID is not present publicly.
it is your email
YouTube username is always your original name. The Gmail username is the ID which is used to log in. Then it is your name that shows up.
Gmail usernames are private properties of a person. They should not be disclosed as it could lead to hacking. Thus, they should not be discussed publicly.
ilovebigonesohyea
i love her
his username is J_beebs94
So that you can log on.
If Justin Bieber has a KIK account, he does not share his username with the general public.
Justin Beiber is an American singer and artist. He got fame by his song Baby. His Gmail ID has not been made public.
You can recover your username also from Gmail. It is the same way you can recover your password. Some steps are to be followed for that.
Gmail account can be created via Google. Gmail accounts need your various details like a username and password. Name, gender and DOB are also some required fields.
You cannot guess the name of person from the Gmail account. The person could have put any name. The username is independent from the original name.