Ah, I think you’re right!
We are having an infestation this year of those fuckers, but I’ve only seen the adult ones until now.
Thank you very much!
Those have become a pest here.
If someone knows how to keep them away, it would be very much appreciated.
Correctly it would be ‘Holz’ and not ‘Holtz’
The latter I’ve heard as a family name sometimes. But you’re probably right, that it historically referenced ‘Holz’
Edit: only found a German page about the origins of the name, and yes, it is very probably coming from forest, woodland, wood
https://namensherkunft.info/namensherkunft-holtz/