Dutch word regenval comes from Dutch regen (Rain.), Dutch val

Detailed word origin of regenval

Dictionary entry	Language	Definition
regen	Dutch (nld)	Rain.
val	Dutch (nld)	(obsolete) catfish (in compounds) case. (in compounds) nightfall. Downfall, demise. Fall (act of falling). Trap, snare.
regenval	Dutch (nld)	Rainfall.