In older times, Lyseng was spelled, Ljøseng. It means light in the valley.
There are actually two Lyseng farms - Lyseng North and Lyseng South. In the Valdres Farm History Book they are referred to as Ljøseng and Ljøsenghaugen (North).
The Lyseng homestead is located near Skrautvål, which is in the province/state of Valdres. The church in Skrautvål is where many Lysengs are buried.