<p>If you are a Japanese national you will be applying as a foreign student and the school will of course be fully aware of your nationality.</p>
<p>If you are a Japanese-American applying as an American citizen and are worried about being “mistaken” for a Chinese- or Korean-American, I wouldn’t worry about it. I imagine there are plenty of people in the Admissions office who can distinguish a Japanese surname from a Chinese or Korean one.</p>