Thank you for your email. I am not sure how this works so will send a copy of this to the email address you provided with yours.
I have managed to get some info from Devon on the Overmass clan from a woman in Australia and another from Devon. Would be glad to share anything you might not have and invite you to do the same.
My ggfather, Harry (Henry) Overmass' mother was Jane White according to my sources, and it would appear that he changed his name to hers. One wonders why.
Look forward to hearing back from you, and how you fit into the scheme of things.