No matter what is one's first name, Japanese will have the same surname by 2531. As per a study, Japanese citizens will all have the same family name in 500 years unless married couples are permitted to use separate surnames.

Why will everyone's family name be 'Sato' in Japan by 2531?

People in Japan could all have the same surname in about 500 years, a study has suggested. Hiroshi Yoshida, a professor of economy at Tohoku University, led the study as part of a campaign to update the civil code that has been in place since the 1800s.

Entire population of Japan to have same surname by 2531, study suggests

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