Sydonia is a proper noun that refers to a place name. Its spelling can be explained using the International Phonetic Alphabet (IPA) as /saɪˈdoʊniə/. The first syllable is pronounced "sai" as in the word "sight". The second syllable "do" is pronounced like "doe" as in the animal. The third syllable is pronounced "ni" as in "niece". Lastly, the fourth syllable is pronounced "a" as in "cat". Therefore, the proper spelling of this word is Sydonia.
The word "Sydonia" is derived from the ancient city of Sidon, which was a major Phoenician city on the eastern coast of the Mediterranean Sea. Sidon was known for its trade and was one of the most important Phoenician cities from around 3000 BCE to 300 BCE. The name Sidon itself is believed to have originated from the Phoenician word "Sidon" or "Zidon", which meant "fishery" or "fishing town". Over time, the name Sidon evolved and gave birth to various names like Sydonia, Saida (the modern Arabic name for Sidon), and many others.