Hi: I'm sure there is a connection as the same names repeat over and over within the family. My g-g-grandmother was Mary Ann Scott, who married Zachariah Robinson in 1852 in Dundas County, Ontario. She was born in 1831 in County Tyrone and died in 1891 in Dundas County, Ontario. Her father was Robert Alexander Scott (1787-1872) born at SixMileCross and died in Dundas County, Ontario. He was married to Ann ? (1788-1858) in Ireland. They were living in Canada by 1848, as their children all married in Canada beginning in 1848. A family history points out that Mary Ann was 10 years younger than her husband, Zachariah, and that she came to Canada as a young girl.
It is likely that the Scotts you mentioned and mine have a common ancestor. Names that repeat within the family are Robert, Alexander, Guy, William, Mary Ann, Jane. I have concentrated more on the Robinson side of my family and haven't spent too much time on the Scotts to date.