Discussion on question by JustOneCupOfCoffee: How to say my last name comes first?

Please don’t call it “first” and “last” name but “family” name and “given” name. Then you can say “my family name comes first”, which is unusual to many people, but easy to understand. And gets the right result, because people either write “Dear Mr. <family name>”, or something like “Hi, <given name>” if they are very familiar.