Eh, maybe it needs renamed. But I don’t think it’s actually the end of the world or anything. Something to remember is that while Leopold II ran the Congo as his personal fiefdom for a long time, during his reign as King of the Belgians he was essentially a constitutional monarch. Meaning he was just a ceremonial peacock, and a largely apolitical “representative of the state and its people”, in that context as the ceremonial Head of State there isn’t necessarily a direct link (theoretically) between Leopold II’s genocidal behavior in the Congo and the order of merit created in his name.
Leopold wasn’t doing those things as King of the Belgians, and in fact that title didn’t give him powers to do much of anything, he was acting as personal sovereign over his holdings in the Congo.
It’s not really much different from QEII right now in Britain. A lot of things ceremonial linked to the crown, and various societal respects given to those, are based not on innate respect for Elizabeth Windsor the person, but for Queen Elizabeth as the largely powerless ceremonial Head of State, representative of the United Kingdom itself.
Now, all that being said Leopold was a largely forgettable monarch other than the gravely negative stuff in the Congo, so there’s little real reason other than “inertia and ceremonial precedent” for keeping the order named after him. But at the same time the naming of the order isn’t doing all that much active harm, or probably all that notable. A lot of shit keeps rolling just based on that sort of mixture of tradition and inertia, in Belgium like anywhere else.
Andrew Jackson on the $20 is probably a more interesting topic, since it’s hard to deny he had a very long list of positive accomplishments in his 40 some years as a military leader and public figure, some important enough it’s possible we’d have a different map today if not for him. But it’s also impossible to deny the negatives associated with Jackson, either. But I think there’s a whole discussion to be had about the general topic of recognizing great men of the past–because the way morality has evolved most men born before 1900 or so will have a very hard time measuring up to moral codes and standards that didn’t exist until they had been long dead.