I do not think that you can say that 'Srdjan' has 'eh' sound between two first consonants. There is two syllables: 'SR' and 'DJAN'. First syllable is unique to Serbian language (as far as I know) and it showcases interesting characteristic of it: consonant 'R' in syllable-building (vowel) role. Mind you, it is not vowel, but still can build a syllable :). 'R' in Serbian is rolling one (kind of one in French language, but not that long). That said, 'SR' would be pronounced as short 'S' in 'so', followed immediately by rolling 'R' (which does not exist in English). In second syllable, 'DJ' is one letter in Serbian, pronounced as very soft 'J' in 'joy'. Maybe close to Japanese 'j' in 'jutsu' (jujutsu). 'A' is 'ah' sound and 'N' is plain 'n' (like in 'Ned'). So it would be: [s] [r] [j'] [ah] [n] where ' indicates softeness. Alternative spelling of the name is SRŠAN, where 'Š' is proper way to write 'DJ'.