Why is American and European people putting their family name after their given name?

Overseas names are already harder to remember, why make it harder by putting your names backward? To use this evening American election as example. I only remember Trump being a family name because of Disney character also named Donald who share name with mr Donald Trump. To me, it would be more natural to write Trump Donald. Like we write Japanese names. When I read ドナルド・トランプ I first think Donald is his family name. Because you write overseas names backwards news about overseas people also write your names backward.

Why is American and European people putting their family name after their given name?
Post Opinion