How do you make a name that ends in s possessive?

There are two accepted forms that show possession for singular nouns ending in s:

Add an apostrophe (') after the existing s at the end of the Word:

• James' or Maris'

Add an apostrophe s ('s) after the existing s at the end of the Word:

• James's or Maris's

Examples:

James' and Maris' essays received an A.

James's and Maris's essays received an A.