* The "Bieber Sweep" (Early 2010s): This is the hairstyle he was most famous for early in his career. It was a shaggy, layered cut with longer hair on top that was styled forward and to the side, often covering part of his forehead. It was sometimes called the "mop-top" by some.
* Short and Textured (Mid-2010s): He transitioned to shorter styles with textured looks. This included shorter sides and back with more length and texture on top that could be styled in various ways.
* Bleached Blonde/Platinum Blonde (Various Times): Throughout his career, he's often experimented with bleached blonde or platinum blonde hair. This has been seen with various cuts, from short to longer styles.
* Long Hair/Man Bun (Mid-Late 2010s): Bieber grew out his hair and often wore it in a man bun or ponytail.
* Buzzcut/Clean Shave (Various Times): He has also, on occasion, opted for a buzzcut or completely shaved his head.
* Modern variations: He has experimented with modern variations, like a more messy and natural look.
It's difficult to pinpoint one single definitive name for *all* of Justin Bieber's hairstyles, as he's constantly changing it up. It's best to describe it by the specific look you're referring to.