2) If you signed it on the wine table, it can be regarded as invalid, because drinking can be regarded as incapacitated (legally), so if you can prove that you drank it or signed it when signing the contract, even if you signed your legal name (the name in the first column of the household registration book and the previous name in the other column), it has no legal effect.

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Supplementary answer:

In this case, the signed contract still has legal effect.

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Your best way now is to go to the public security bureau or police station where your household registration is located to explain the situation, and try to get a certificate to prove that your current name is your common name.

Only in this way can we prove that we are real creditors, otherwise we will be very passive in court.