There are two accepted forms for possessive singular nouns that end with an s:
Add an apostrophe (') after the existing s at the end of the word:
Examples:
The meeting is being held in Ms. Dobos' office.
The meeting is being held in Ms. Dobos's office.
The plural form of the proper noun Jerry is Jerrys.The plural possessive form is Jerrys'.example: The Jerrys' last names are Brown and Green.
The plural form of the proper noun Cody is Codys.The plural possessive form is Codys'.Example: The two Codys' last names are Green and White.
The plural form of the noun Chris is Chrises.The plural possessive form is Chrises'.Examples: The two Chrises' last names are Brown and Green.
The plural form of the proper noun Lois is Loises.The plural possessive form is Loises'.Example: The Loises' last names are Brown and Green.
The plural possessive form of the last name Ellis would be the Ellises'.
The plural form of the proper noun Diaz is the Diazes.The plural possessive form is Diazes'.Example: The Diazes' children are twins.
The plural form for the proper noun Sarah is Sarahs; the plural possessive form is Sarahs'.Example: The two Sarahs in my class are cousins and the Sarahs' last names are the same as well.
The plural form of the name Max is Maxes.The plural possessive form is Maxes'.Example: The two Maxes' last names are Oscar and Mayer.
The plural form of the proper nun 'Tony' is Tonys.The plural possessive form is Tonys'.Example: The Tonys' last names are Marco and Polo.
The plural form of the noun Chris is Chrises.The plural possessive form is Chrises'.Examples: The two Chrises' last names are Brown and Green.
The plural form of the proper noun Chris is Chrises.The plural possessive form is Chrises'.example: The two Chrises' last names are Green and Brown.
The plural form of the proper noun Bess is Besses.The plural possessive form is Besses'.Example: The two Besses' last names are Brown and Burke.