1. Start with "K": The "c" at the beginning is pronounced like a hard "k" sound, as in "cat."
2. "i" is like "ee": The "i" sound is similar to the "ee" in "see" or "tree."
3. "onn" is "on" with a nasal sound: The "onn" is like the "on" in "gone" or "won," but with a slight nasal quality.
4. "aith" is like "eye": The "aith" is pronounced like the "eye" in "eye" or "high."
Putting it together: The pronunciation of "Cionnaith" is roughly "Kih-n-eye".
Remember that the exact pronunciation may vary depending on the individual speaker and their accent.