Statistics for occurrence #1 of “Northern Virginia” in chapter 5.26 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: Volume 2.:

.... S. A. here the Williamsburg old stage road is intersected by theNine-mile road, at a point seven miles east of Richmond, was fought the first great contest between the Confederate Army of Northern Virginia and the Federal Army of the Potomac. The junction of these two roads is called Seven Pines. About one mile from Seven Pines, where theNine-mile road crosses the Richmond and the York River Railro...
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