Where does “dwaalgast” come from?

dwaalgast (Dutch) comes from Dutch gaſt, from Dutch vrij, from Middle Dutch vri, from Old Dutch frī, from Proto-West Germanic frī, from Proto-Germanic frijaz, from Proto-Indo-European priHós, from Proto-Indo-European preyH- — to love, to please.

dwaalgast (Dutch): vagrant animal occurring outside its species' usual range, usually a vagrant bird