I'm used to situations when systems do all sorts of things to my last name, given that it contains a non-Latin letter.

So far I've encountered such scenarios:

- The system accepts my original last name just fine.

- It says that a last name can only contain Latin letters and thus refuses to accept it.

- It replaces the non-Latin letter with some gibberish.

- It drops the non-Latin letter altogether.

Especially the last two scenarios have lead to some confusing/frustrating situations in the past. For example, not being able to check-in to a flight with the same last name that I entered during the booking process (only using the "transformed" last name worked).