It was at this time that he married Margrit Wyssling, before leaving for Sumatra for four years. Frey took on his wife's name as Frey-Wyssling due to how common the name of Frey is in Switzerland.
It was during this period that he united with Margrit Wyssling, before embarking on a four-year journey to Sumatra. Frey incorporated his spouse's family name as Frey-Wyssling because the name Frey is common in Switzerland.