KSI

British YouTube personality, rapper, actor, and boxer

Born: 19 June 1993, London
Age: 33
Birth name: Olajide Olayinka Williams Olatunji

KSI — Image: Wikimedia Commons · About this image

KSI, born Olajide Olayinka Williams Olatunji on 19 June 1993 in London, is a British and Nigerian YouTuber, rapper, boxer and actor. He has been active since 2010 and has been a member of the Sidemen since 2013. His YouTube channel under the handle ksi had about 16.8 million subscribers in October 2025, and his clips channel, KSIClips, had about 3.38 million at the same time.