The spelling of Isaac’s surname and that of his children and grandchildren varies widely in the records, including Mabry, Maybry, Mabrey, Maberry, Mabery, Mayberry, and even Maybury. Most descendents after about 1920 settled on either Mabry or Maberry, split about evenly, and you will tend to find each camp assigning their own spelling to the ancestors. But I think the truth is that the early generations didn’t care how their name was spelled, making no spelling any more right than any other.

See the census notes for Isaac’s second marriage for the 1850 census reading showing the younger children of this marriage.