How can surnames be made plural? Is that right to say the Sanchez or the Sanchezes?
Can you give some other examples? The Smith, the Smithses? If both are acceptable which one in more common?
I have heard a non native saying "the Sanchezes" and it sounded weird for me.

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sorry i was wrong
here is the link for it
http://grammar.quickanddirtytips.com/how-to-make-family-names-plural.aspx

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Surnames are proper nouns like country or city names so you can't attach plurals to them like new york, sydney. you can never say new yorkes or new yorks similarly you never say smithes.

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Buitrago=Buitragos Lol way to say plural lastnames

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They become plural like everything else.  Smith becomes Smiths.  Jefferson becomes Jeffersons.  Sanchezes sounds normal to me.

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i don't know properly , but i think smith is popular , i mean more common in use .