Here's how to break down the pronunciation:
* Δ (Delta) is pronounced like a "th" sound, as in "thin"
* α (Alpha) is pronounced like the "a" in "father"
* ν (Nu) is pronounced like the "n" in "new"
* ι (Iota) is pronounced like the "ee" in "see"
* ή (Eta) is pronounced like the "ee" in "see", but held slightly longer
* λ (Lambda) is pronounced like the "l" in "look"
So, the full pronunciation of Daniel in Greek is tha-nee-eel.