Someday the writers and editors at Yahoo! Style might actually display some knowledge of English grammar. This is not that day:
The plural of a name that doesn’t end in S is just the name with an added S, like this: the Clintons, the Obamas. (Adding an apostrophe makes the name a possessive, not a plural.) If the name ends in S, make it plural by adding an ES. But under no circumstances does the plural involve an apostrophe. Unless you’re writing about Mr. and Mrs. Apostrophe; then they’re the Apostrophes.