what is Pieter's surname

My real last name is Mouthaan. I got it from my father. And my mother's last name is Van de Ven. So officially it's Pieter Mouthaan. But I have middle names "Jozef Thomas Richard". So Pieter Jozef Thomas Richard Mouthaan-Van De Ven. But yes, short: Pieter Mouthaan (aka Pieter Levels). :D

I heard his last name is Avicii

@levelsio Why did you choose Levels as surname?