Some places just put a few letters into each field (like say for the name Jessica, first: Jes, middle: si, last: ca, or something like that). The DMV did that, and then listed her name on her license as <last>\<first> <middle initial>. Others have insisted on putting "nosurname" in the last name field. The immigration people put "FNU" as first name, and her given name in the last. At some places she's put her name twice, once in the first, and once in the last.
Not anything close to what she's had to endure, but my name doesn't fit the standard mold either. I prefer to use my middle name and really dislike using my first name (shared whith my dad, who I don't have a good relationship with). I'm endlessly having to explain every single stinking time I interact with pretty much anyone.
Anyway, the take away is, please please please (!!!) don't make assumptions about people's names! Ideally just one field labeled "name", and let the user interpret that as they see fit. If you need to collect a legal name then you need to validate it anyway. If you really must do first name / last name then at least make the last optional and also include a field for "what should we call you" or "nick name" or something.
Great ted talk about Myanmar names: https://www.ted.com/talks/cynthia_ma_shwe_sin_win_not_good_w...