My wife and I briefly talked about this before we got married nine years ago. We decided that we would both keep our family names. My wife only has one sister, and so the continuation of the family name might have been an issue. However, when her sister married (an arranged marriage of course) her husband agreed to change his own family name - hence the name would continue. In fact with 3 sons and 1 daughter, the name will comfortably last another 100 years at least! (Somehwhat ironically my brother-in-law has two other brothers and one sister, all married, all in their fifties, and all childless. It is HIS family name that might cease to exist in the next 40 years - I think one of my nephews might change his name though).
Children born in Japan automatically take the same last name of their birth mother.
Reasons for our choice? Firstly, my wife works as a nurse in a large municipal hospital. She has to wear a name-tag of course and the last thing she wants to be doing all day is field questions ad nauseam about her own ethnicity, or that of her husband. I'd go so far as to suggest that a Japanese employee's family name - if NOT Japanese, might actually impede their promotion at work. There are a lot of arseholes in management positions.
The other major reason was my simple ambivalence to the issue. So what if my son has a different surname from his father. If he chooses to live in the UK when he's older then he can use his British-registered name, which is the same as mine. Or continue with his Japanese name - up to him.
What I would opt for, for your children, are Japanese first names that can also function in Dutch or English. Rin, Tomu, Ken, Risa, Ren, Jorji, Hana, Ema are English examples off the top of my head - there are dozens more.