Edit - I can't find any source supporting the contention that fighting during the Battle of Glendale took place on a farm owned by Watts. Even if it did, you would have needed to give the name of another owner of a farm where fighting took place.
Perhaps no Civil War battle has so many different names. Virtually every Confederate who fought there called it the Battle of Frayser’s Farm, but Union soldiers knew it as Glendale, Nelson’s Farm, Riddle’s Shop, Charles City Crossroads, New Market Crossroads, or White Oak Swamp. http://www.nps.gov/rich/learn/historyculture/glendalebull.htm
According to various sources the bulk of the fighting occurred at the Whitlock Farm and Syke's Farm. Though the Battle of Glendale is commonly referred to as the Battle of Frayser's Farm that was owned by the R.H. Nelson family, the actual fighting took place west of the farm.
But then you ask for two names (plural) indicating that you probably look for two different last names ...
So Frayser's Farm came to my mind, which had belonged to the Frayser family before the war and was now owned by the Nelson family. As the Battle of Glendale is also called Battle of Frayser's Farm, then this farm might be the second one you had in mind. My answer is that the names are Sykes and Nelson - although the name of Whitlock should also not be forgotten.