His real name is Justin Bieber, pronounced bee-ber.
No he does not. He has 2 half siblings that are made public but as far as cousin's go, only close family and friends know.
Justin Timberlake ALL THE WAY.
His name is Justin Bieber because when Pattie and Jeremy had their baby, they decided to name him Justin, and usually the baby takes the fathers' last name, so his birth name is Justin Bieber. [: