Just have a single "name field" and maybe preferred name, which is not the same. The family/given name format doesn't make much sense here. Indian name: Sathiavelllu Arunachalam, known as SA or Seth SE Asian ethnic Chinese names: Harry Lee Kuan Yew, (English name) (Surname) (Given name). Hated the name Harry and got it removed, though many Chinese are referred to by an English name. Indonesian name: Fatimah Azzahra (…
A simple, unimportant one: how do you politely address the person? In Germany, you'd start a letter with "Sehr geehrte Frau Dr. Musterfrau", which implies knowing the last name, gender and title of the person. You can drop the title, but dropping the gender makes the whole thing impersonal. Using the full name feels off.
In my case, it was to address a resignation notice, so it was a bit of a nitpick with no legal consequences. However in other cultures and scenarios it can matter a lot more.