My thought was King Albert I. Probably saved Belgium during WWI.
Schwarzenegger?
(Yes, apparently my knowledge of foreign-born persons is limited to action movie stars!)
Manneken-Pis
Most famous person who happens to be Belgian, whether or not you think of them as being from Belgium?
Or, person who is famous for being Belgian—the kind of person you think of when someone says “Think of a famous Belgian”?
Don’t think you can get more famous for being Belgian than to be known as The Muscles from Brussels
You left “waffle” off your poll. 
Wink wink
Not really a person
Nothing about your title specifies it needs to be a person. “Belgians” are also a breed of draft horse.
Depends on which legend you believe.
Who’s that?
I am a bit sad you did not include Julio Cortázar in your list, though I would still have voted for Hergé.
I would also have included André Franquin, Morris and Peyo, I am a fan of Belgian bandes desinnées.
I don’t think Cortazar counts, his parents were diplomats.
If Audrey Hepburn counts, so should Cortázar
I’m surprised Leopold is winning - I’m sure more people would have heard of Magritte. Some of his paintings are part of pop culture.
Leopold was barely known of outside Belgium until just a few short years ago, and asking people to get the right regnal number would be a challenge.
Audrey Hepburn isn’t really known as a famous Belgian, exactly. She counts as Belgian because she spent her first 7 or 8 years there, but her wartime escapades were in the Netherlands, not Belgium.
I’ve totally heard of Magritte. I’ve even attended a major show of his works. But I had no recollection he was Belgian. That attribute is a not a big part of why he’s well-known. The whole and entire reason Leopold is well known is his connection to Belgium.
Said another way I think of the royal turdbird as “King Leopold II of Belgium”. That’s his name. “Magritte of Belgium”? Not so much.
The other names on the survey? Never heard of 'em. Though upon looking up Hergé I thought “Oh yeah, Tintin. Should’ve recognized that! :smack:” Audrey Hepburn & Jean Claude VD? Heard of them, know their claim to fame, but again not with even the slightest connection to Belgium.
Maybe I’m unusually unread, or don’t much care what country non-political figures come from. But I bet I’m not too alone in that. Heck, I even have an uncle by marriage who’s a born and raised Belgian who came to the US in his 40s. You’d think with that connection I’d know more about prominent Belgians as Belgians. Nope.
If you’re thinking only of people who are famous for being from their country, though, that rules out almost anyone except royals. Van-Damme would be out on that metric too, since his fame is down to being an action movie star, not being Belgian.
Yes. But my point isn’t that their fame stems from their Belgianness or whatever. It’s that if their fame isn’t connected to their country of origin, why would I know what their country of origin is? The OP’s list could have had a bunch of other European ringers in it and I’d not be the wiser. Unless those ringers were politicians or royals.
I suppose I answered a question here that wasn’t exactly what was asked.
Right now, it just might be Dr. Peter Piot, virologist, epidemiologist, and COVID-19 survivor.
If you know where Brussels is then you most likly know where Van Damne is from. Problem is most Americans don’t know where Brussels is . . . maybe in the vegetable aisle.