In a study by the National Institute of the Korean Language based on a sample of year 2007 applications for South Korean passports, it was found that 48.6% of people with this surname chose to have it spelled in Latin letters as Jung in their passports.
Rarer alternative spellings (the remaining 5.2%) included, in order of decreasing frequency, Joung, Cheong, Chong, Jeoung, Jeung, Choung, Jong, Cheung, Juong, Jeng, Chyung, Jaung, Jueng, and Zheng [REF].