This is the 6496th most frequent French word.
hollerich
"Hollerich" is not a French word; it is a place name, specifically a district in Luxembourg.
Hollerich is used here as a place name indicative of a location in Luxembourg.
À Hollerich, il y a des nombreux cafés animés.
In Hollerich, there are many lively cafés.
Hollerich identifies the specific region or neighborhood where the action is taking place.
Je vais visiter un ami qui vit à Hollerich.
I am going to visit a friend who lives in Hollerich.
This use of Hollerich refers to the subject region's characteristic features.