Susan: There was an Isaiah Moncrief, born 1825 in Wilkes Co GA, died 1880 in Blount Co AL, which borders Jefferson Co. He was the son of Laban Moncrief (1780-1871) and Sarah Sowell. He was married twice, first to Sarah Garrett, then to Martha Lloyd. I don't have any info on children, so I don't know if this is the Isaiah you're looking for or not. If you think it is, I have several more generations of his ancestry. You can e-mail me directly if you like. Hope this will help you.