Filling Names in DS156

[amys]

Dear Sir,

In My passport the "Given Name" is empty and
I have my full name in the "SurName" line.

Now how do I fill the Names in DS156.
Can I write the "SurName" in my passport to the 'SurName' of DS156
and put None for "Given Name" of DS156.

In case of my Spouse passport, the "SurName" is empty and the
"Given Name" has her full name. How do I fill DS156 in this case

Please advice how to go about this, Has anybody come accross this.

Thanks.

[immihelp]

There is no clear best answer for this.

You could either write 'Given name' as 'FNU' (First Name Unknown) or write actual given name in that.

Same thing for surname. LNU (Last Name Unknown) or write actual surname in that.