My mother's maiden name was Ackerman, her father having changed the name from Akerman in the late 1800's.The book of births, deaths and marriages in Newburyport prior to 1850 lists the 11 children of John Akerman and Margaret (births dates etc. not given). Their son, John Jr., born March 8, 1775 is my 3rd great grandfather. I do not yet know why the spelling of the name was changed. I would like to find more information on John and Margaret. It is very possible that your N.H. Ackermans came from Newburyport, Mass. and I would be glad to share with you any information that I have.