KSIs real name is Olajide Olayinka Williams Olatunji. He was born on June 19, 1993, in London, England. KSI is an acronym that stands for Knowledge, Strength, and Integrity. He adopted the nickname from his original gaming alias on YouTube, KSIOlajideBT, which was an amalgamation of the acronym, his surname, and his broadband provider. KSI has achieved unparalleled success throughout his career as an English Internet personality, professional boxer, and musician.