If your last name was romanized incorrectly, it’s going to be pretty difficult to expect people to pronounce it according to standard Beijing pronunciation. Add to that the fact that Chinese is a tonal language, (a concept unheard of in Europe and America), getting Americans to pronounce your last name correctly is almost mission impossible. Even in China, you’ll find that people have a wide range of dialects and regional accents and may pronounce your name in vastly different ways.