The name Maalbeek, meaning "mill brook", comes from the Dutch words beek (meaning "brook") and maal (meaning "to mill"). Molenbeek has a similar derivation. The stream was vaulted in 1872, at which time there were 58 ponds along it. Nowadays, only six are left: the ponds of La Cambre Abbey; of Ixelles (two); of Leopold Park; of Marie-Louise Square; and of Josaphat Park.
There is another stream in the vicinity named Maalbeek,[1] also a tributary to the Senne, in Grimbergen, and two other streams named Molenbeek, found in Beersel and in Laeken. The Woluwe river also has a tributary named the Kleine (little) Maalbeek, in Kraainem.