Occupation Surnames

[CJ]

I recently came across this graphic by Marcin Ciura showing the most common European surnames that have their origins as a specific type of occupation.
According to Wikipedia, Gruber is a German surname from Austria and Bavaria, referring to a person from a geological depression, mine, or pit. Did anyone know this?

 

[skimble]

According to the German language Wikipedia page, Gruber is an occupation name in grapevine-growing regions for someone who digs pits for vine shoots. Take your pick ...

 

[CJ]

According to the German language Wikipedia page, Gruber is an occupation name in grapevine-growing regions for someone who digs pits for vine shoots. Take your pick ...

I found this which discusses both possibilities but finds both theories rather unconvincing.

Origin of the German and Austrian surname Gruber

<p>The name <b>Gruber</b> is a moderately popular surname in Germany and the <a href="https://jakubmarian.com/most-common-surnames-by-country-in-europe/">most common surname</a> in Austria. It is,

jakubmarian.com