Japanese people could all be called Sato by 2531, study warns. But they’d need to get married first

Everyone in Japan could one day have the same surname unless its restrictive marriage laws change, according to a new study. But the country’s dwindling marriage rate could buck that trend and a rapidly declining population might render it moot entirely. Unlike most of the world’s major economies that have done away with the tradition, Japan still legally requires married couples to share the same surname. Normally, wives take their husband’s name – and same-sex marriages still aren’t legal in …