Writing the wife's name on the credit card can help the credit card issuer to understand the cardholder's family status and economic strength more comprehensively, so as to evaluate the credit risk more accurately and give a more suitable credit limit and interest rate. Why do I need to fill in my spouse's name when applying for a credit card? The main reason is that the credit card issuing bank will decide the card issuing amount and interest rate according to the common credit evaluation of the cardholder and spouse. Therefore, filling in the spouse's name can help the credit card issuer to understand the cardholder's family status and economic strength more comprehensively, so as to evaluate the credit risk more accurately and give a more suitable credit limit and interest rate.