What is the birth name of the YouTube celebrity who played himself in the #REHASH episode of South Park?
Rehash (South Park):  YouTube celebrity PewDiePie plays himself in this episode. PewDiePie: Felix Arvid Ulf Kjellberg ( ; ] ; born 24 October 1989), better known by his online pseudonym PewDiePie ( ), is a Swedish web-based comedian and video producer.
Felix Arvid Ulf Kjellberg