Understanding Louis’s and Louis’

Navigating the rules of English grammar can sometimes feel like trying to find your way through a maze. One common point of confusion is how to form the possessive case of nouns, especially with names ending in “s.”

Let’s clear up this confusion using the name “Louis” as an example. We’ll explore when to use “Louis’s” and when “Louis’” is appropriate, providing examples for a clearer understanding.

Louis’s (Singular Possessive)

The form “Louis’s” is used to indicate that something belongs to a person named Louis. This follows the general rule of adding ’s to the singular form of a noun to make it possessive, even if the noun ends in “s.”


  • Louis’s book is on the table.
    • This means the book that belongs to Louis is on the table.
  • We need to wait for Louis’s approval before we proceed.
    • This means we need to wait for the approval that comes from Louis.
  • Louis’s car is parked outside.
    • This indicates the car owned by Louis is parked outside.

Louis’ (Used in Plural Possessive and Sometimes Singular)

Traditionally, “Louis’” can be used for the singular possessive case of a noun ending in “s,” particularly for style guides that prefer omitting the additional “s” after the apostrophe for names ending in “s.” However, it’s more commonly seen in plural possessive cases, which is not applicable for the name “Louis” as it’s a singular name. But, for educational purposes, if there were more than one person named Louis and something belonged to all of them, “Louis’” could theoretically be used.

Singular Possessive Example (Stylistic Choice):

  • Louis’ book is on the table.
    • This can also mean the book belonging to Louis, according to the style that prefers not to add an extra “s” after the apostrophe.

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Understanding the Differences: A Table

To make these differences clearer, let’s lay them out in a simple table:

FormUsageExample Sentence
Louis’sSingular possessive (one person)Louis’s book is on the table.
Louis’Singular possessive (stylistic choice)Louis’ book is on the table.

Tips for Remembering

  • If you’re following modern grammar rules, add ’s to singular names ending in “s” to show possession.
  • If you’re adhering to a specific style guide that prefers not adding an extra “s” after the apostrophe for names ending in “s,” just add an apostrophe after the “s.”

The choice between “Louis’s” and “Louis’” often comes down to the style guide you are following or personal preference, especially in singular possessive cases. For clarity and consistency, it’s best to choose one form and stick with it throughout your writing.

Understanding when to use “Louis’s” and “Louis’” helps ensure your writing is clear and grammatically correct. Remembering these guidelines can help you navigate the complexities of English grammar with greater ease.

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