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you write to google saying you need to change your account name.
They tell you to apply again under a different name
when that is approved you change your code and write to them and they close your old account.
If the earnings in your old account are over $100 they will write the cheque. So in one month you will get 2 cheques.
Write to Adsense support - seems the only way. I'm sure it must happen all the time, as people do change their names.