Dutch word vallen comes from Proto-Indo-European *spōl-, Proto-Indo-European *pol-, Proto-Indo-European *(s)pōl-, Proto-Indo-European *h₂ph₃elh₁né-, and later Proto-Germanic *fallaną (To fall.)

Detailed word origin of vallen

Dictionary entry	Language	Definition
*spōl-	Proto-Indo-European (ine-pro)	to fall
*pol-	Proto-Indo-European (ine-pro)
*(s)pōl-	Proto-Indo-European (ine-pro)	to fall
*h₂ph₃elh₁né-	Proto-Indo-European (ine-pro)
*fallaną	Proto-Germanic (gem-pro)	To fall.
fallan	Old Dutch (odt)
vallen	Middle Dutch (dum)	To collapse. To drop. To fall. To fall, to be located, to be part. To fall, to occur, to happen. To let oneself fall, to throw oneself.
vallen	Dutch (nld)	(auxiliary, with te) to be able to be. (intransitive) to fall, to begin (of a time period). (intransitive) to fall, to tumble.

Words with the same origin as vallen