Plural of people names

[Yankee]

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I only like:
2. There are 3 Thomases in my class.

"There are three people named Thomas in my class."

Trying to talk about a group of books belonging to 3 different people named Thomas doesn't make sense and/or would not be something you're ever likely to have to actually say.

Just out of curiosity, is "Thomas" supposed to be the first or the last name?

Amy
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Amy
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ESL teacher, translator, and a native speaker of American English

[Yankee]

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As I said, I don't like any of your options.

I would say "These 6 books belong to the three people named Thomas."

Amy
_________________
Amy
.
ESL teacher, translator, and a native speaker of American English