The possessive form for the name Adams is Adams'.
Not likely. Adams' can only be the plural possessive of the first name Adam. It is hard to imagine a proper context for such a form. If you want the singular possessive of the last nameAdams, it is Adams's, and if you want the plural, it is Adamses'.
Junior's
When the name of a business is a possessive noun, the possessive form doesn't change; for example:McDonald'sMcDonald's parking lotWhen a possessive noun is part of the name of a business name, but not the last word, the last word also forms a possessive; for example: Jack's SeafoodJack's Seafood's parking lot (although no one would criticize the Jack's Seafood parking lot)
The possessive form of the proper noun Mattice is Mattice's.Example: Dr. Mattice's office is in building two.
The possessive form of the last name Richter is Richter's.
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 spelling of the plural possessive form of "Diaz" is "Diaz's."
The plural form of the proper noun Charles is Charleses.The plural possessive form is Charleses'.Example: The two Charleses' last names are White and Green.
The possessive form of the proper noun Henry is Henry's.Example: Henry's party is this Saturday.
The possessive form is Lois's.This is Lois's birthday.
The possessive form of the noun guest is guest's.Example: What is the guest's name?
To form the plural possessive form for names, add an apostrophe and an "s" after the plural form of the name. For example, if the name is "Smith" and it is pluralized as "Smiths," the plural possessive form would be "Smiths'.