RootsChat.Com

Hi all.  This is my first time at roostchat.com. Looking for suggestions for a project I am working on.  Many of my maternal ancestors came to what is now the United States in the 1600s.  I want to mark a map of the UK with the origins of these ancestors.  For some I have found enough documentation to record the information, but some have no information regarding where they came from or I have found other people stating they were from a few different locations.  What would be a good way to determine the location my ancestors came from?  Most are listed as being from England, but I've also seen Wales and Scotland, oh and probably Northern Ireland.  Anyone need anything from this side of the pond?  Macki