Friday, October 28, 2016
Making a last name plural is a matter of spelling, not punctuation. Do not add an apostrophe. Follow the rules of spelling.
Except don't change the spelling of proper names when making them plural. Add es to most proper names ending in es or z: Gonzalezes, Jameses, Joneses, Parkses. Add s to other proper names, including most proper names ending in y even if preceded by a consonant: the Clintons, the Abernathys, not the Abernathies.