How To Write The Last Name Plural . As the post states, “to show the plural of a name that ends with a ch, s, or z sound, add es.…. The members of the johnson and smith families. How To Make A Last Name Plural Possessive That Ends In S from goodtorial.blogspot.com Pray for the woodses. we're having the brookses over for dinner. if this feels too awkward, there is an easy way out: So smith becomes smiths if you want to mean more than one. If your last name already ends in an s like stevens or adams all you would need to do is add an es.