I went to grade school with a kid named Dick Rectrum. He was a mean dog by fourth grade.
Had a classmate in grade school named Richard Small. When the teacher did attendance, she would always call out last name first. Richard, for some reason, preferred to be called Dick.
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How Dick Came to be Short for Richard
http://www.todayifoundout.com/index.php/2012/04/how-dick-came-to-be-short-for-richard/