'Izeger Knupp' means the Itzig hill.
'Knupp' is Luxembourgish for a hilltop or hump. On a 1999 city map, Izeger Knupp is the Luxembourgish name of the Rue d’Itzig, named after Itzig, a village in the commune of Hesperange. Bonnevoie grew where old roads met: even before its medieval convent was founded, one of them came from Itzig.