Surname and FNU in DS-156

[sunilv]

Hi,

I have applied for a Tourist Visa for my mother last day and the Interview date is on May 02.
Her name in Passport is like this:

Surname: ....................(blank)
Given Names: MARY VARGHESE

On the Online Application Form I entered,

Surname: MARY VARGHESE
First and Middle Names: FNU i.e., First Name Unknown (On website they asked to use like that if I want to)

Is it correct or not?
In my Interview Letter the name displays as FNU MARY VARGHESE

Whether it make any issues later when I apply for an Immigrant Visa or GreenCard for my mom?

If it is wrong do I need to cancel the Appointment since I am not able to modify those fields?

Is there any problem If I split her name and write first name in first & middle name cloumn and last name in surname column in DS-156?

Can I make the Observation at Passport Office and show this change to take effect in my DS-156 at the time of Interview?

[sunilv]

Can we make any changes by hand (correct the surname as first name and last name) in the already completed DS-156 and show them at the time of Interview?

Please reply me as soon as possible. My interview date is on May 02.

[Manav]

There is no need to change the Application Form . Since FNU only states that fist name unavailable.

so go ahead.