Upvote:4
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