郑 (Zhèng) is the 21st most common Chinese surname;
浩 (hào, 'vast') is a very popular given-name character for boys, evoking grandeur (think
浩瀚 hàohàn 'vast').
郑浩 is therefore a generic but evocative male name found across China; in subtitle corpora it usually refers to drama or film characters.
