Earlier quoted context omitted.
Not only is it strange, it’s obviously very sexist in practice. In majority of the cases, it’s always the woman who changes her last name. The husband gets to keep his. I still find it very strange and shocking that powerful women with successful careers in modern society still keep changing their names after getting married.
It is not sexist at all, let alone "obviously very sexist". Don't impute malicious motives to people like that, it's extremely rude.
I don't think Belgium's feelings will get hurt, besides wait until you learn about all the other things that Leopold II did.