Official name is Monument aux Artistes forains morts pour la Patrie - Monument aan de Foorreizigers eervol gesneuveld voor het vaderland https://monument.heritage.brussels/fr/buildings/34877

Pierrot Héroïque  - Heldhaftige Pierrot is a alt name. 

The name is used by official during the commemoration and also used by forrains and Touristic guides.

https://www.facebook.com/BXLvilledebruxelles/posts/tbt-monument-au-forains-morts-pour-la-patrie-le-monument-rendant-hommage-aux-for/10156811444352882/

https://culture-media.be/141e-foire-du-midi-jusquau-21-aout/

https://twitter.com/dimitristrobbe/status/1680104407315226627