You're right, I was thinking of this in the context of an English-speaking country/institution (mostly since I do often see this demand in those contexts as well; to be clear, I think it's a reasonable request, but not a reasonable demand or legal requirement). In the context of a Belgian customer of a Belgian bank it's definitely more surprising; but I also wouldn't categorize it as "inaccurate personal information", but awkward transliteration to a foreign alphabet; as you said, that may be strange and possibly even run afoul of national language laws, but I wouldn't use GDPR against it

> [Korean] has as much relevance in Israel as English has in Belgium

Legally maybe, but certainly not demographically/culturally; I mean, certainly there is a difference in the expected probability of being understood, especially given the highly-overlapping character sets