Sigmund Freud 
Psychopathology of Everyday Life [EPUB ebook] 

During the year 1898 I published a short essay On the Psychic Mechanism of Forgetfulness. I shall now repeat its contents and take it as a starting-point for further discussion. I have there undertaken a psychologic analysis of a common case of temporary forgetfulness of proper names, and from a pregnant example of my own observation I have reached the conclusion that this frequent and practically unimportant occurrence of a failure of a psychic function—of memory—admits an explanation which goes beyond the customary utilization of this phenomenon.
If an average psychologist should be asked to explain how it happens that we often fail to recall a name which we are sure we know, he would probably content himself with the answer that proper names are more apt to be forgotten than any other content of memory. He might give plausible reasons for this “forgetting preference” for proper names, but he would not assume any deep determinant for the process.