Where to use a apostrophy for plural names?

Answer 1

An apostrophe is used to show possession; to show that something belongs to the possessive noun. Using an apostrophe to show possession by a plural name (a proper noun) is exactly the same as using the apostrophe to show possession for any noun ending in -s.

The best way to tell if you should just put an apostrophe after the existing -s or to add the apostrophe -s after the existing -s is if extra syllable is pronounced or not. Most often, the extra syllable created by adding the additional -s to plurals names does not work. For example:

• Chris, Chris's classmates: two Chrises, the Chrises' classmates
• Bess's and Bess's birthday: two Besses, the Besses' birthdays
• The Brown family, the Browns' house.
• The Jones family, the Joneses' dog

Answer 2

Apostrophes are not used to form the plural of a name. Simply add an "s" to make a name plural, such as "the Smiths" or "the Johnsons". Apostrophes are only used for possession or contraction, not to indicate plurals.