Not at all. You, as a foreigner, basically have no standing under Japanese family law and are basically irrelevant when it comes to the family register. You have no family register. Your wife does. She can choose to change her name to your name or not. You and your details are merely information that are recorded in her register. She and you are doing nothing illegal.
You always will be an outsider. They won‘t accept you in „their system“ ( / world) as a foreigner.
btw when I wanted to change my last name my japanese husband said „You can‘t do that. You‘re not japanese.“
He really believed I wasn‘t allowed or privileged enough to use his japanese surname as a foreigner. I was really astonished by his strong opinion...
Laws and beliefs are still mostly medieval...
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