JJ or J.J. has been used as a nickname by several people, including:
Justo Justo or JJ, Filipino columnist and news presenter
J. J. Abrams, American media director and producer
JJ Cale, American singer-songwriter, recording artist and influential guitar stylist
JJ Lin, Singaporean mandopop singer-song writer, composer and actor
JJ Olatunji, English YouTube personality and rapper also known as KSI
Jay-J, American house music disc jockey
Jennifer Herrema or JJ, American singer and songwriter with the band Royal Trux
Junaid Jamshed or JJ, Pakistani recording artist and religious figure
JJ Lehto, Finnish motorsport racing driver
J. J. Raterink (born 1981), American football player
J. J. Redick (born 1984), American basketball player
J. J. Syvrud (born 1977), American football player
J. J. Watt, American football defensive end for the Houston Texans of the National Football League (NFL)
Jimmie Johnson, American NASCAR driver
Robert Jay (judge), noted in court reports as "Jay J."
Jonathan "JJ" Johnson, American businessman and politician from Utah
J. J. Thomson (1856–1940), English physicist
JJ (nickname) Wikipedia (Text) CC BY-SA