Nicknames in America

As I started my research work on finding issues with Genealogical information, I ran into a problem that finding right nicknames using the internet. As I always do first thing I did was pound my research query in Google of course Google game me a hit (what do you expect its Google). The results that I found were fairly good and recognized. I found two main link one was publish from Connecticut and other was Genealogical Information related website. But my biggest concern was not about the links that I found, it was about from what date to what date these nick names were used. Simple example If your name is Richard as my host families name is, automatically your nick name is Dick but my questions was is it true to the modern day nicknames. How about if your name is Kevin, and modern day people use Kev instead of Kevin. But the nick name lists that I found on internet didn’t have modern day nicknames.