Hi, Sorry for the delay in responding. I will check into this tomorrow and see if I have anything that aids in your task. There are other researchers with whom I work who are familiar with some of the Guernsey Co Calverts. I will make sure they take a peek.
I do suggest that you enlist a male Calvert from as many diffrerent lines as possible to participate in the FT/DNA study. If you have questions on the Calvert Surname project, email me at email@example.com. We welcome new participants to aid in sorting out these various Calvert family lines.