Oh, what fun. A mystery of sorts. You have already gotten some good ideas on how to search. It will certainly take some time to search all of those names, but you may find some wonderful info and who knows some children or grandchildren who might like to know there mum or grandma or auntie was remembered in a quilt. I feel a story coming on. Keep us all posted from time to time. We can all live vicariously through your adventure.
My one suggestion is to contact a quilt museum and ask their process of quilt maker identification.