[canjobear]

The English convention is to pronounce -eu- in Greek words as /ju/, not /ef/.

[telotortium]

Yes, basically Greek words in English are pronounced as Latin loanwords, according to how the Greek words would have been pronounced in Latin around AD 1 (except that ph and th, but not ch, are pronounced as fricatives in English). Greek αυ and ευ were still pronounced as diphthongs at the time.

[elkos]

My name is Ελευθέριος and I transliterate it as Eleftherios in English.

[spapas82]

There's a "standard" way of how greek words should be transliterated in English (ELOT 743). You can test it here https://www.passport.gov.gr/passports/GrElotConverter/GrElot...

And yes, Eleftherios is the correct transliteration :)

[elkos]

I know. I've even seen my name written as Eleytherios.