There's no such language as "Belgian".
The three official languages of Belgium are French, Flemish/Dutch, and German.
Witaj
καλώς όρισες
The Hawaiian word for welcome is "aloha." It is commonly used as a greeting or to express love and kindness.
bienvenido/a (adjective) bienvenida (welcome!)
"Willkommen"
In Belgium, you can say "graag gedaan" to mean you're welcome.
Bienvenue
ברוכים הבאים
Bienvenidos --teamhoyt
Belgian in French is "belge."
Welcome
vous êtes bienvenue