Board Thread:Questions and Answers/@comment-68.2.144.3-20130418101731/@comment-6747658-20130418104414

From what I know, in the japanese version Dr Clark was not named by a gender specifically, the English version however turned Dr Clark into a he, most likely because they did not see Clark as a last name, but as a first name where Clark is generally a male name.

Other then that, it's also a slight retcon when they tried linking every previous character to someone else, Dr Clark being Para-Medic, Sigint being Donald Anderson and so on.