Most Chinese given names are 1 or 2 characters long. Were there any proper, Han Chinese given names of 3 or more characters, that weren't transliterations or pseudonyms?
Surnames are different; while most are only one character, there are quite a few that are two characters or more. However, I haven't found any example of given names being longer than 2 characters. For example, despite keeping their Manchu surname, the Aisin Gioro clan adopted Chinese naming conventions: Puyi's brother was named 愛新覺羅溥任, with a 2-character given name.