George and Eva

Am looking for the surname of MacKnight(scotish)that later changed to Knight. I am not sure where or when the family came to the usa although I have heard stories that they came thru Canada and were "horse thiefs". My maternal grandfather was William James Knight. He was born in the Fulton/Hannible area of New York State, just outside of Syracuse, NY where he later moved to and died there. Any help would be appreciated. He was one of 11 siblings