How Dick became a nickname for Richard is known and is one of those “knee bone connected to the thigh bone” type progressions, somewhat similar to how the word ‘soccer’ came about. Due to people having to write everything by hand, shortened versions of Richard were common, such as ‘Ric’ or ‘Rich’. This in turn gave rise to nicknames like ‘Richie’, ‘Rick’, and ‘Ricket’, among others. People also used to like to use rhyming names; thus, someone who was nicknamed Rich might further be nicknamed Hitch. Thus, Richard -> Ric -> Rick gave rise to nicknames like Dick and Hick around the early 13th century.
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