我不知道那是什么名字

如果您不知道某部电影的名字，可以尝试以下几种表达方式：

I don't know the name of that movie.

I don't know what that movie is called.

Can you tell me the name of that movie？

I'm not sure about the name of that film.

What is the name of that movie？

希望这些表达能帮助您找到想要找的电影名称。