Lucas’ or Lucas’s?

Lucas’ is a singular possessive form of Lucas. E.g., “Lucas’ birthday is in May.” Furthermore, Lucas’s is also a possessive form of Lucas. E.g., “Lucas’s dog is called Sam.” In formal writing, for AP Style, you should use Lucas’. In comparison, the Chicago Manual of Style prefers Lucas’s.

The following chart offers a helpful breakdown of the different forms of Lucas.

Singular possessiveLucas’ / Lucas’s
Plural possessiveLucases’

Here are the different forms in some example sentences.

  • Singular: Mark and Jenny have named their new son Lucas.
  • Plural: There are two Lucases in the office.
  • Singular possessive: Lucas’ eyes are green and brown.
  • Singular possessive: Lucas’s car is that green Porsche.

The plural form, Lucases, is not standard and is not common. However, you may occasionally come across Lucases in a plural possessive form. Particularly when referring to a family with the surname Lucas.

  • Plural possessive: The Lucases’ house is that one on the corner.

However, in these cases, Lucas can be a plural noun. Therefore, for the same example, most people would use one of the regular possessives.

  • The Lucas’ house is next door to my mother’s house.

Now we have covered the basics of using the forms of Lucas. Please keep reading to learn about how to use Lucas in formal writing and ensure you never make a mistake again.

Our helpful examples will make the rules much more easy to understand so you don’t have to be in doubt anymore when using the possessive form of Lucas.


Lucas’s is the singular possessive form of the boy’s name Lucas. Therefore, you use it when you want to say something belongs to a person named Lucas.

Review these examples to see what we mean:

  • Lucas’s sense of humor is just like mine.
  • Lucas’s car is parked right in front of the building.
  • Everyone admired Lucas’s dedication to his craft.
  • I borrowed Lucas’s book for the weekend.
  • Lucas’s paintings always have a touch of surrealism in them.
  • I’m always impressed by Lucas’s work ethic.
  • I’m planning to attend Lucas’s birthday party next Saturday.

Furthermore, Lucas’s is the version you should use if you write a piece of formal writing that follows the Chicago Manual of Style.

In addition, Lucas’s with the apostrophe and extra “s” is the more common possessive form of the name Lucas, according to Google Ngram.

Furthermore, people commonly use it as a plural possessive to refer to families with the surname Lucas.

Here are some examples:

  • The Lucas’s dinner party invitation arrived in the mail this morning.
  • The Lucas’s house is the big one at the end of the street.
  • The Lucas’s annual barbecue is something everyone in the neighborhood looks forward to.
  • It’s the Lucas’s tradition to put up the brightest Christmas lights.
  • The Lucas’s garden is always filled with colorful flowers.
  • The Lucas’s family photos are displayed prominently in their living room.
  • The Lucas’s garden always has the most vibrant flowers during spring.
  • I borrowed this recipe from the Lucas’s family cookbook; it’s their grandmother’s special dish.

Now, let’s elaborate on when you should use Lucas’ in your writing.


The term Lucas’ is the singular possessive form of the name Lucas. Furthermore, you should use Lucas’ when writing a text that follows the Associated Press Stylebook.

You can use Lucas’, pronounced Lucas’s, to indicate that something belongs to a person called Lucas.

Here are some great example sentences:

  • Lucas’ essay was a little short on the word count.
  • Lucas’ parents were both at the basketball game.
  • Lucas’ backpack seems to be filled with art supplies.
  • That must be Lucas’ notebook on the table.
  • I can’t find Lucas’ coat; has anyone seen it?
  • Lucas’ teacher spoke highly of his dedication.
  • Lucas’ shoes are the same ones I’ve been wanting to buy.
  • Have you seen Lucas’ new bike? It’s really cool!

In addition, people also use Lucas’ as the plural possessive, for example, to refer to a family named Lucas.

Take a look at these examples:

  • The Lucas’ dog is always running on our lawn.
  • The Lucas’ property stretches all the way to the river.
  • It’s delightful to watch the Lucas’ children play in their yard.
  • The Lucas’ annual picnic is a highlight for the entire community.
  • Most of the apples in this pie came from the Lucas’ orchard.
  • The Lucas’ old barn has been converted into a community center.
  • Everyone in town attends the Lucas’ Fourth of July fireworks display.
  • The treehouse in the Lucas’ backyard is a favorite play spot for all the neighborhood kids.

So, just remember that it is completely correct to use both Lucas’s and Lucas’. This is the case both when you’re using Lucas as a first name and a family name.

However, just remember to be consistent in your writing so you don’t mix between the two variations of the possessive.