I live now in Sofia and rely on the app OSMAnd~.
I got as Latin name for the bus stop
"Cent"ra kv. IliJanci"
This also applies to transliteration services like 
https://translit.cc/bg

OSMAnd~ does not take the int_name. Therefore I experimented to specify name:en And this works, I get in OSMAnd~ displayed the name:en.
Since it does not harm to also have name:en besides int_name. I think my change does not harm anybody but helps other foreign OSMAnd~ users.