How many syllables in a proper noun?

There's no set number of syllables in a proper noun. The number of syllables depends on the specific name.

Here are some examples:

* One syllable: John, Mary, Kate, Tom

* Two syllables: Robert, Jessica, Michael, Emily

* Three syllables: Alexander, Elizabeth, Christopher, Stephanie

* Four or more syllables: Elizabethan, Constantinople, Michelangelo

What matters is how the word is pronounced. You can count the syllables by listening to the word and seeing how many distinct vowel sounds are present.