You can separate this name to two parts:徐 is regarded as surname, which is succeeded from the family, and 若滢 as first name, which contains most of the meanings. In my understanding, ‘若’ stands for ‘like’ or ‘as’ in ancient chinese letter, whereas ‘滢’ can be translated to ‘crystal clear’or ‘pure’. On the whole, the expectations of this name is that, she (Yes, it is a girl’s name) will grow up as a pure, moral, sincere person.