First of all, Jackie Chan is Chinese, not Japanese.
Chan is a Chinese surname (his real original surname, though "Jackie" is a stage name).
It has nothing to do with the Japanese diminutive suffix "-chan".
(Incidentally, the Chinese family name "Chan" as in Jackie Chan is typically pronounced チェン/Chen in Japanese. Even in cases where the Chinese name チャン/Chan is used in Japanese, Japanese people can understand from context that it's a Chinese name and not the Japanese suffix -ちゃん.)