I traced Isgrigg back to the 1500's in England where Isgrigg was originally Eskrigg but mutated at Ellis Island I suspect. My father's father was named Harwood Edward Isgrigg, and my dad was junior. I understand that Harwood is English as well, and so now my middle name is Harwood as is my 12 year old sons. I hope I've helped. Please let me know if you have any other information.