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As far as I understand it, that's not the general rule.

This is hardly a authoritative citation, but it cites a number of authority and comports with my understanding as someone whose name ends in `s`:

"Nearly all authorities agree that if you want to make a possessive out of a singular noun like Kansas that ends in an s, you need to add ’s at the end. Just call it “Ross’s Rule.”"

https://www.legalwritingpro.com/articles/feeling-possessive/

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Depends on your region and the name in question. e.g. macquarie (https://www.macquariedictionary.com.au/resources/view/resour...) say:

> Personal names ending in s are these days often given the regular apostrophe s, whatever their number of syllables or their sound:

>

> Burns's poetry

> Dickens's novels

>

> Those who have occasion to refer to classical or biblical names of several syllables may still prefer the apostrophe alone, as with:

>

> Jesus' teachings

> Moses' law

> Euripides' plays

The Chicago Manual of Style which is pretty much the authority in the USA says you do apostrophe-s for all possessives even if it ends in an “s”. So “Ross’s” if it is a singular Ross.

But if you’re describing a family possession, it would be Rosses’ as is possessed by more than one Ross.

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