When it comes to writing names in possessive form, Carlos’ and Carlos’s are two options that often create confusion. The possessive noun form indicates ownership, such as when you want to show that something belongs to Carlos. The question of whether to add an apostrophe and s or just an apostrophe alone depends on grammar rules and personal preference. Some people might say Carlos’s bike to indicate the bike that belongs to Carlos, while others may opt for Carlos’ bike.
The choice between Carlos’ and Carlos’s is guided by different style manuals, such as the Chicago Manual of Style and the Associated Press Stylebook. These guides offer different advice on how to treat names that end with s. The Chicago Manual of Style favors adding both the apostrophe and s, making it Carlos’s house, while the Associated Press prefers the simpler Carlos’ house. Contextual factors and personal or regional preference also play a role in making this decision.
In written English, this is one of those tricky areas where there isn’t a single correct answer, but rather a matter of preference or style. While both forms are grammatically correct, understanding the rules and choosing a style based on your audience can help navigate the waters of this unfolding grammar question. Whether you choose Carlos’s or Carlos’ may depend on the personal or common style in use, but both will reveal your correct choice for expressing possession.
The following table shows the singular forms of the name Carlos.

The following table shows the singular forms of the name Carlos when written in its possessive form. As you can see, there are two common versions: Carlos’ and Carlos’s. Both forms are used to indicate ownership, but the alternative form with the apostrophe and s (Carlos’s) is often seen as more formal, following the rule of adding both when the name ends with s. The other form, Carlos’, is popular in more casual contexts and is in line with AP Style guidelines, which prefer the simpler version without an additional s.
To maintain consistency in your writing, it’s important to follow the rules and consider the context in which you’re writing. While Carlos’s may appear more grammatically precise, Carlos’ is often used in everyday speech. Depending on your stylistic preference, both forms are correct, but you should aim to use one consistently throughout your text. Whether you choose the plural possessive or the singular form depends on your audience, the grammar rules you prefer to follow, and the context in which you are writing.
You might enjoy reading: Professional Ways to Say I Just Wanted to Follow Up in an Email
Carlos’s
When using the name Carlos’s, it indicates ownership or possession, showing that something belongs to Carlos. This form follows the rule of adding both an apostrophe and s to proper nouns ending in s. While it’s grammatically accepted, stylistic preference can vary. The Chicago Manual of Style and other style guides often recommend this form for consistency in text, especially in more formal writing. This version is correct when indicating singular possessive, like in “Carlos’s studio,” suggesting ownership. Whether you use Carlos’s or Carlos’ depends on your preference and the grammar rules you follow, but it’s important to be consistent throughout your writing
Carlos’
The name Carlos can be written in two different possessive forms: Carlos’ and Carlos’s. The apostrophe is used to indicate ownership or possession. When following grammar rules, both versions are correct, but the choice depends on stylistic preferences. The Chicago Manual of Style suggests using Carlos’s (adding both an apostrophe and an s), while the AP Style prefers Carlos’ (just the apostrophe). This is a matter of linguistic variation, meaning there is no right or wrong choice as long as consistency is maintained throughout the document. The key is to choose one form and use it consistently to avoid any repetition or confusion in your writing.
The Historical Context

The use of possessive forms like Carlos’ and Carlos’s has evolved over time, influenced by linguistic and grammatical changes throughout history. In earlier centuries, the rules for forming possessives were not as rigid, and variation in usage was more common. Grammar guides such as the Chicago Manual of Style and AP Stylebook reflect this linguistic evolution, with each offering style preferences based on the context and purpose of writing. The morphology and syntax of the possessive form have been shaped by orthography and semantic rules, creating different approaches to expressing ownership. Consistency in writing is key, but the choice of form—Carlos’ or Carlos’s—may depend on personal style preference or the particular context in which it is used. This development highlights the importance of understanding how the rules have shifted, providing a deeper perspective on the contextual use of possessive forms in academic or formal writing.
You might enjoy reading: Heartfelt Ways to Say ‘Thanks for the Warm Welcome’
Traditional Rules vs. Modern Usage

The traditional rules of English grammar emphasize the use of ’s for forming the possessive case of a singular noun or proper noun. According to classic grammar conventions, you would add ’s to Carlos to make it Carlos’s when showing ownership. This was considered the correct and straightforward way of forming the possessive form. However, in modern usage, many linguists and writers follow a simpler approach, using just an apostrophe without adding the ’s for names that already end in s—like Carlos’—especially when the name is a common one. This has led to an ongoing debate among writers and authors, as there is no universal rule to dictate which form is best in all contexts.
The linguistic variation between the traditional and modern approach can create confusion, as both forms are used in different contexts. In academic and formal writing, the traditional rule of adding ’s may be preferred for clarity and consistency, while in informal contexts, the apostrophe alone may be seen as sufficient. The morphological structure of the possessive has evolved over time, influenced by historical shifts in English usage. This variation reflects a broader linguistic trend, where contextual and stylistic preferences influence which form is chosen. While traditional grammar offers a clear rule, the modern usage of Carlos’ has become acceptable, especially in everyday communication.