Forming the Possessive with Names Ending in s
How to form the possessive with names ending in s? There’s no consensus. Even the experts disagree. Mignon Fogarty (better known as Grammar Girl) prefers to leave the extra s off. But the Chicago Manual of Style says that forming the possessive with names ending in s is just like forming the possessive with names that don’t end in s: add an apostrophe-s (’s).
Before we get into the details, let’s look at a few examples of the possessive form of names that don’t end in s. The rule? Add apostrophe-s (’s):
Mr. Clemmer’s studio
Julius Erving’s uniform