I'd say "SEH-mi-rah-MEES" from: Σ = (capital) sigma ≈ "S" ε = epsilon ≈ "EH" μ = mu ≈ "M" ί = iota ≈ "I" before two consonants ρ = rho ≈ "R" probably with a little trill α = alpha ≈ "AH" μ = mu (again) ι = (another) iota (probably a little different and longer, often in association with) ς = (lower case) sigma (at the end of mythologic names like "Anubis", "Artemis, "Osiris"...)
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Σ = (capital) sigma ≈ "S"
ε = epsilon ≈ "EH"
μ = mu ≈ "M"
ί = iota ≈ "I" before two consonants
ρ = rho ≈ "R" probably with a little trill
α = alpha ≈ "AH"
μ = mu (again)
ι = (another) iota (probably a little different and longer, often in association with)
ς = (lower case) sigma (at the end of mythologic names like "Anubis", "Artemis, "Osiris"...)