Name difference in Passport and Visa

[cheerful000]

My mother got her visitor visa, but despite using the "FNU" method in the application, the issued visa has her name written differently.

In the passport:
Surname: <blank>
Given Names: SEEMA AHMAD

In the visa:
Surname: AHMAD
Given Name: SEEMA

Can anyone advise how the name should be entered on the customs declaration and I-94 form prior to arrival in US? Thanks.

[kk]

Just enter according to visa.

[cheerful000]

Thanks kkk.

I appreciate your advice. However, can you please explain if it is based on an official rule or any real experience?

It appears to me that the "Surname" is a label only used in the passport. I have obtained a copy of the Customs Declaration form and the full I-94 form. Both of them require a "Family" name and "First (Given)" name.