Originally Posted by
FlyerInCmh
Many Indonesians have one name (well-known people included -- e.g. former Presidents Soekarno and Soeharto). Like what the OP does, they usually repeat their names... so first and last names are the same.
Where the singular name is not repeated, "FNU" is sometimes used -- including on the passports of some senior government officials that visit the White House from time to time but only have one name. This means "field not used" but I doubt that most TSA employees have any clue about that.