Olajide Olayinka Williams Olatunji was born on 19 June 1993.[1][2][3] His father, Jide, is from Ibadan, Nigeria and his mother, Yinka, is from Islington, London.[115] Raised in Watford, Hertfordshire,[5] he was educated at Berkhamsted School in Berkhamsted, where he met future collaborator and Sidemen member Simon Minter.[116] KSI is a supporter of Arsenal F.C.[117]