Julius's or Chris's; a singular noun ending in 's', whether its a common or a proper noun should add the apostrophe 's' to form the possessive. Chris's desk is next to mine.T … he boss's office is at the end of the hall.For the plural forms that end in 's', only add the apostrophe after the ending 's'.uch names are pluralized by adding ES and then made possessive by the single apostrophe used for plural nouns: Myers, Myerses, Myerses'. That's appropriate for last names, but not necessarily for other proper nouns.