Xeruskōz are Celts?

[blitzkrieg80]

early on, friebe decribed the Xeruskōz as celtic peopel in orgin and thinking. mainly because of the relations with the also celtic (hallstatt) xabukaz/chauki(Friebe) and because of there headhunter-mentality - arminius send the head of varus to marbod and the Xeruskoz nailed alot of heads in the woods and sacrifice prisoners in "weidriesen" after the battle. but i don´t know if that is typical for celts only. an other aspect are the settlements that often end with -um (for opidum or dunum) like in beckum today.

the particular Celtic fondness of head-hunting aside, the practice is very common to Indo-European culture: SEE Scythians who use their enemies' heads as cups.

placenames (European in particular) with -um endings are coincidental because that just happens to be an Indo-European plural suffix /declension - amazing!
For instance, Old English has -um as the dative plural ending for strong masculine/neuter nouns: OE scipum = 'ships'

placenames with -dunum (eventually meaning 'town' from 'hill-fort') would be much more correct, as the Celtic root implies more, and linked to some extent to the very common Germanic root seen in -ton (Washington / Hampton) from -tun in Old English, thought to be loan but the jury is still out, especially since it could be an unknown Indo-European root common between... but considering the sheer amound of oppida in Europe...

yep - the Cherusci are thought to be named after the Germanic word for 'sword' and they are in a Celto-Germanic zone of trade and influence, thus they indeed wield Celtic longswords, while somewhat too numerous an aggregation for a proper portrayal, a lack of would be equally innaccurate.