The genitive (possessive) singular of all English nouns is formed by adding -'s, regardless of the spelling. The only exceptions are Jesus and Moses, which may form the genitive with the apostrophe alone.
Following the "double s rule" (e.g. Joneses) would indicate an -es plural for names such as "Mankiewicz", which would become "Mankiewiczes". The plural of such names, however, creates yet another double sibilant, so the possessive would likely be "Mankiewiczes'..."
Nouns (names) that end with a -z form their plural as any singular noun, by adding and apostrophe s ('s) to the end of the word.
Examples:
I placed an apple on Mrs. Diaz's desk.
Fritz's car was parked next to a hydrant.
Nouns (common or proper) ending with -z form the plural by adding -es. Examples:
The plural forms for proper nouns (names) are the same as for common nouns. The rule for nouns ending with z (as well as s, sh, ch and x) is to add -es to form the plural: Martinez to Martinezes.
DIAZ'
Italian last name which is another meaning for casa or house but A plural meaning of it - source it's my last name and my Italian teacher told me
boy lautner girl swift if you dont like those make it your last name.
Titar
Mraz is his last name Mraz is his last name
Taylor Swift's last name is Swift.Swift
The plural is Welches. It is perfectly regular: a noun ending in a 'ch' sound forms the plural by adding 'es', as in mulch, mulches.
gross'
Names (first or last) are made plural by adding an -s or an -es (for names ending in -s, -sh, -ch, -x, and -z) to the end of the name. Standard irregular plural forms are normally not used; for example, the Kennedy family are the Kennedys, not the Kennedies; the Columbus family are the Columbuses, not the Columbi.
To make a last name ending in S possessive, add an apostrophe after the S. For example, "Jones'" is the possessive form of the last name Jones.
Neither. the apostrophe would only be used to indicate possession. Names the end in s require -es to form the plural, e.g. the Joneses
The plural form for the name Amos is Amoses.
The name Ruiz is a proper noun; proper nouns are always capitalized.The plural form is Ruizes.
To form the plural of a last name ending in s, add es to the end. For example, the plural of the last name Smith would be Smithes.
The plural is Averys.
The plural form of the name "Windish" is "Windishes."
To form the plural of a name ending in -ss, add -es to the end or the word; for example:one Jess, two Jessesone Bess, two BessesTo form the possessive of a plural noun ending with -s, add an apostrophe (') at the end, for example:The two Jesses' last names are Green and Brown.The two Besses' last names are Smith and Jones.
The plural is Harrises.