Dutch word grafgift comes from Dutch gift, Dutch graf (Grave (slang) very.)

Detailed word origin of grafgift

Dictionary entry	Language	Definition
gift	Dutch (nld)	(dated) poison. Donation; something given (away) voluntarily.
graf	Dutch (nld)	Grave (slang) very.
grafgift	Dutch (nld)	Grave good (item buried as part of a burial).