According to The Merriam-Webster the plural version of your surname is Mayberrys:
The same rule is confirmed by the following sources:
Pluralisation of surnames:
Making a last name plural should never involve an apostrophe. The members of the Johnson and Smith families, for instance, are the Johnsons and the Smiths, not the Johnson’s and the Smith’s.
Last names ending in s are no different. Most nouns ending in s are pluralized by adding es. This applies to last names as well. The members of the Edwards and Doss families are the Edwardses and the Dosses, not the Edwards’s and the Doss’s.....
There is one important way in which plural last names differ from other plurals: the last syllable of names ending in y does not become ies when made plural. The members of the Kennedy and the Clancy families are the Kennedys and the Clancys, not the Kennedies and the Clancies.
Plural of family names:
- When a family name (a proper noun) is pluralized, we almost always simply add an "s." So we go to visit the Smiths, the Kennedys, the Grays, etc.When a family name ends in s, x, ch, sh, or z, however, we form the plural by added -es, as in the Marches, the Joneses, the Maddoxes, the Bushes, the Rodriguezes. Do not form a family name plural by using an apostrophe; that device is reserved for creating possessive forms.
Family names are like brand names:
you don’t change the base spelling. For example you make “blackberry,” the fruit, plural by changing the “y” to “ies”; but you make “BlackBerry,” the phone, plural by simply adding an “s” to the end: “BlackBerrys.”
It’s the same with names. “Kennedy” becomes “the Kennedys.”
How To Make Your Last Name Plural For Upcoming Holiday Cards
- What about names ending in Y? Just add an “s”, not “ies”. Season Greetings from the Hensleys.
- Happy holidays from the Berrys (plural form of the name Berry—notice that we do not drop the "y" and add "ies" to proper names).