Okay, there are two key rules to remember when it comes to pluralizing last names:
1. Write out the last name in its entirety
2. You never need an apostrophe
You just have to add an s, even if the last letter is y.
Here are the exceptions:
If the name ends in s, z, ch, or sh, add es.
If it ends in x, add es unless the x is silent.
Felix Family will be Felixes
Bordeaux --> Bordeauxs
Claus --> Clauses
Haynes --> Hayneses
That's it! I hope you find this helpful. Happy writing!
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