Is James DeWeaver a living descendant of the Scottish Inventor and Industrial revolutionary James Watt?
Maybe. If James Watt had daughters or granddaughters, and they married, their children – Watt’s grandchildren and great grandchildren – would not be Watts, they would be something else. Assuming half of your children are women whose children will take their father’s name, and half of your sons’ children will be women whose children will take their father’s name, 1/2 of your grand children 3/4ths of your great grandchildren 7/8ths of your gg grandchildren . . . will not have your surname. Only research will tell, however. If you guessed they were related because they were both named “James”, then King James of Scotland would be related to the Disciple, and be Jewish.