Hi! You'll find quite a bit of discussion on Richard/Dick and other similar nicknames in these posts

• How did "Dick" go from being one of the most popular nicknames in America for a boy named Richard to a phallic nickname that has caused many of those men to shun being called "Dick"? - follow the links - there's much more on these names downstream

• How did names like Robert and John turn into nicknames like Bob and Jack?

All of the posts have been archived, so if you have follow-up questions, just ask them here and tag the relevant usernames to notify them