What is the possessive form of Keats?

Answer 1

There are two accepted forms for possessive singular nouns ending in s:

Add an apostrophe (') after the existing s at the end of the word: Keats'

Add an apostrophe s ('s) after the existing s at the end of the word: Keats's

Example:

Keats' poetry is still quoted today.

Keats's poetry is still quoted today.

Answer 2

The possessive form of "Keats" is "Keats's" or "Keats'."