Super honorable mention to Ryan Anderson hitting Manu Ginobili in the nuts (unintentionally) and injuring Ginobili for several weeks in 2016. I couldn't find video of it, otherwise it would be on the list.

Other honorable mentions:
Donovan Mitchell going through Aron Baynes' nuts on a screen (2019)
Russell Westbrook reverse kicking KCP while shooting a jumper (2016)
Kobe Bryant hitting Andre Iguodala as Iggy shoots a jumper (2010)
Kevin Garnett hitting Channing Frye as Frye shoots a jumper (2011)
Joel Embiid kicking Marcus Smart in the nuts while shooting a 3 (2018)
Luka Doncic kicks Marcus Smart in the nuts and apologizes (2019)
Chris Paul pushes off Kevin Durant's nuts to create space (2016)
Russell Westbrook reaches for ball, instead hits Tatum's nuts (2018)
Lebron kicking Andre Iguodala's nuts as Iggy gets steal in finals (2017)
Tristan Thompson hits Draymond on a loose ball (2017)
Dwyane Wade knees Robert Covington in the nuts (2018)
Draymond Green throws loose ball off Kyle Lowry's nuts (2017)
Lebron knees Steph while setting a screen (2018)
Lance Stephenson hits Lebron in the nuts (2017)
JR Smith hits Glen Rice Jr in the nuts and gets suspended (2014)