You could look up the n most common Japanese family names (myoji ,名字). You probably would get a list like Yamaha, Suzuki, Watanabe, Tanaka, etc. Of course, this

You could look up the n most common Japanese family names (myoji ,名字). You probably would get a list like Yamaha, Suzuki, Watanabe, Tanaka, etc. Of course, this wouldn't cover every case, but it might help. 頑張ってください！