[Wasabista]

If you want an authentic-sounding surname, here is a list. (Don't use Tanaka or Suzuki because they're so common, your readers will assume you didn't bother to do any research!)

Sekine
Hasegawa
Ochiai
Adachi
Yasuoka
Terashima
Ogawa
Okawa
Miura
Koga
Higashi

Just off the top of my head...