Name of Person paying for trip without Surname

[Neha Madaan]

Hi

I live in USA and I am applying USA B2 Visa for my parents. I read on immihelp that if you dont have last name in Passport, fill FNU in first name.
But I am confused about what name should go in the person paying for your trip or contact person in USA in my parents' DS-160....

[raj.gp]

My passport has Given Name as - Raj , Last Name - blank
All my I-797 documents have First Name - No Given Name, Last Name - Raj

However on my I-140 i received with following name, First name - Raj, Last name - LNU.
My company attorney tried to get it corrected by raising...

[nitin.developermca]

Hi,

My passport don't have last name. Below is the latest travel booking.

Passport : FirstName is "ZZZ YYY" and Last name is ""
H1 B visa : FirstName is "FNU" and last name is "ZZZ YYY".
Flight Ticket (airline suggested...