You do add es to names ending in s, so Joneses is correct for the family of people whose surname is Jones. I'm not sure who the "Johns" are. Are they two friends of yours both named John, if so, you would say, "I'm going to dinner with the two Johns tonight.
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Anonymous"I have three Denises in my class." Is that the correct plural for Denise?Yes. The plurals of proper nouns are formed according to the same rules as the plurals of common nouns. The only exception that comes to my mind is that the final y doesn't change: