Final answer:
Vandalism is the crime named after the Germanic Vandals known for sacking Rome in 455 CE.
Step-by-step explanation:
The crime named after the Germanic tribe that wreaked havoc over Gaul, Spain, and most famously, Rome in 455 CE is vandalism.
The Vandals were a Germanic people who, originating in present-day Poland, migrated through Gaul into the Roman territories, including Spain and North Africa, and famously sacked Rome in 455 CE with relatively little bloodshed. This event, despite its limited scale compared to other sacking of cities, led to the coining of the term 'vandalism' to describe the malicious destruction of property.