Proper nouns are little bit different when it comes to pluralization. Generally, you simply add an 's' to form the plural, unless the name ends in 's, x, ch, sh, or z', in which case you add 'es' to form the plural. You should never change the base spelling. For example, you would not change a 'y' to 'i' and add 'es' like you would for a common noun that ends in 'y'.
Common noun: candy ==> candies
Proper noun: Candy ==> Candys
That being said, in many cases you would do nothing to form the plural of a proper noun which ends in 's' with a hard 'z' sound. This is the most nebulous rule of all because there are many exceptions.
Mr. and Mrs. Jones ==> The Joneses are coming over for dinner. (exception)
Mr. and Mrs. Jamers ==> The Jamers are coming over for dinner.
Good Luck
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