Bryan I hope you get this message after such a long time since you posted yours! I have been researching the Kirkman name for many years and have a large family tree in the Leicestershire/Derbyshire/Nottinghamshire area. I think that the Kirkman/Kirman/Kerman emanate from the same source (per Oxford Dictionary of English surnames). I have traced my Kirkmans back to 1500 in Melbourne, Derbyshire. I am especially interested in learning more details of the origin of our surname. Could you send me more details?
Another possible source for our surname is the Danish Viking invasion in the 9th and 11th centuries. Have you investigated that?
I would love to hear from you on my direct e-mail address firstname.lastname@example.org