Here's why:
* Different Pronunciations: The word "Egyptian" can be pronounced with different stresses, which can affect syllable count. For instance, in American English, the stress is typically on the first syllable ("E-gyp-tian"), resulting in three syllables. In some other English dialects, it could be pronounced with the stress on the second syllable ("Egyp-TI-an"), also resulting in three syllables.
* Other Languages: The word "Egyptian" exists in many languages. The pronunciation and therefore syllable count will vary depending on the language.
To determine the syllable count, you need to know the specific pronunciation you're interested in.