@Марин Good question.  I am not sure that there will ever be a cut and dry answer to this question.  At the high school my name is always: KAPOЛИH EMИΓ which is how the Ministry of Education "translated" my name.  When I picked up my litchna karta my name was misspelled and my name in Bulgarian now reads: KAPOЛИH EMИT.  And then there's the language school, my certificate for the first level Bulgarian class (I got a 6) says: KAPOЛИH EMAй.  Luckily no one has even been able to say my last name correctly my whole life so it's not such a big deal now.  But lots of people call me Caroline which is something new to me.