According to The Scots Peerage and the Baronage Press, William was assumed dead by 5 June 1651, when Andrew, 2nd Lord Fraser, William's father, granted his estates to his successor, Andrew, 3rd Lord Fraser. The Scots Peerage also states that he was alive in 1646.
One must keep in mind that the British Civil Wars went on from 1642-1651.
The U. S. Passenger and Immigration Lists Index, 1500s-1900s, found on Ancestry.com lists a William coming in from Canada with his wife Ann (or Jane Anne) Porter (aka Potter).
Ancestry.com
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Featured National Park champion connections: William is 11 degrees from Theodore Roosevelt, 18 degrees from Stephanus Johannes Paulus Kruger, 15 degrees from George Catlin, 17 degrees from Marjory Douglas, 22 degrees from Sueko Embrey, 17 degrees from George Grinnell, 16 degrees from Anton Kröller, 18 degrees from Stephen Mather, 21 degrees from Kara McKean, 17 degrees from John Muir, 12 degrees from Victoria Hanover and 22 degrees from Charles Young on our single family tree. Login to find your connection.
https://www.familysearch.org/photos/artifacts/116961884
Now also at this site https://www.familysearch.org/search/tree/results?q.anyDate.from=1625&q.givenName=William&q.surname=Frizzell It lists this William’s father as Hayden Frizzell, and William’s death as 1796 in Isle of Wright, Virginia. There is probate a probate information link on this page https://www.familysearch.org/tree/person/sources/GW1R-Y8D, but it is only links to Ancestry.com that I cannot access since I am not a paying member. Has anybody researched these for family names? Might be useless as seems it is only mentioning William in connection to another persons probate. While I would like to think that I am related to Robert the Bruce, the fact is there were several Williams around this time, and none of them have a clear tie to being William Fraser. But, it does not sound like this William Frizzell was an indentured servant if he got off the boat in 1649 with a wife. My understanding was that the indentured Scottish POWs were all men and were not allowed to marry until after their 7 years. I don’t know—just too many loose ends.