US Tourist Visa, different name on passport and visa

My mom's passport has Last name/ Surname blank, while the US tourist visa has the First as FNU. Will this be a problem for entering US.
Best Answer
No. From the US embassy in the UK:
This is not an error. The visa is issued in the name that appears in the passport. FNU means First Name Unknown.
If the surname is not included in the passport as in the following example: Given Name: Happy Traveler; Surname: Blank.
The visa will be issued as follows: Given Name: FNU; Surname: Happy Traveler
If the passport contains only the surname of the holder and not a given name as in the following example: Given Name: blank; Surname: Happy Traveler
The visa will be issued as follows: Given Name: FNU; Surname: Happy Traveler
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Can visa name and passport name different?
Please note that your visa should have the exactly same name as per your passport. Even spelling error can create a problem. Shah Manish Dharmendra. Please double check the passport and visa, if any doubts contact consulate immediately.Does changing name in passport affect visa?
No. Your visa is still valid as long as your passport is not expired. Make sure to carry all of the required documents to show evidence of the name change.Do I need a new U.S. visa if I change my name?
If your name has legally changed through marriage, divorce, or a court ordered name change, you will need to obtain a new passport. Once you have a new passport, the Department of State recommends that you apply for a new U.S. visa to make it easier for you to travel to and from the United States. I changed my name.What happens to U.S. visa after name change?
If name on the visa and passport is same then old visa is valid. But if name is completely changed then new passport and visa is required. If only surname is changed in case of marriage then while travelling both passports along with marriage certificate needs to be carried. Old visa on old passport ia still valid.FNU- Different name in passport and visa! Is it valid?
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