应该写个表示歉意的信, but do not lose your dignity, simply say something like "I just realized that I made a mistake in the company name. Sorry about the carelessness. Please do not take this wrong, I am very interested in this position."
Good Luck如果manager发现了这个错,而你却什么也没表示,他会认为你这个人粗心大意。既使由于没有更好的候选人,而录用了你,也会留个不好的印象。以后有什么错,你会被第一个怀疑到。如果我是你,我会立即纠正错误。如果他因此不用你,这是天命。如果用你,会对你有好印象。