Johnson’s brother, Donovan “Puff” Johnson, plays basketball for the North Carolina Tar Heels.[29] Johnson's mother is a school nurse. This inspired Johnson to give out special appreciation to the healthcare workers and their families on their February 7, 2021 home game against the Boston Celtics, the Suns' first home game since March 8, 2020 to have fans enter their arena after dealing with the COVID-19 pandemic.[30] Also, his mother is a Croatian American.[31]