Markus's or Markus'?

The term Markus’s is a singular possessive form for Markus and is recommended by the Chicago manual of style. E.g.The key to the office is in Markus’s pocket. Markus’ is also a singular possessive form for Markus but is less common of the two. E.g., Markus’ coffee mug is on the kitchen counter.

In a nutshell Markus has two singular possessive forms.and it’s a matter of preference which you choose.

Below is an overview of different possessive forms for Markus and their examples

Form	Example
Single	Markus
Plural	Markuses
Singular possessive	Markus’s or Markus’
Plural Possessive	Markuses’

Single: Markus is an excellent musician.

Plural: In celebration of their success, the Markuses organized a picnic with close friends and family.

Singular Possessive (apostrophe): Markus’ guitar playing is phenomenal.

Singular Possessive (apostrophe + ‘s’): Markus’s drumming skills are impressive.

Plural Possessive:Fans felt connected to the Markuses’ families through shared stories at dinners.

There are two singular possessive forms for the term Markus. You form one of them by adding an apostrophe at the end of Markus and the other one by adding an apostrophe and an ‘s’ at the end. You can use any or the two forms according to the style you prefer to use.

Markuses is the plural form. Use it when you are referring to multiple people named Markus or members of the same family with the last name Markus.

The Markuses hosted a barbecue, inviting friends and neighbors to join in the festivities.

Furthermore, Markuses’ is the plural possessive for Markus. Use it when you are talking about something that belongs to multiple people named Markus.

Fans celebrated the Markuses’ success with them at a surprise dinner party.

Markus’s

Markus is the singular possessive form for Markus endorsed by the Chicago Manual of style. Use Markus When you are referring to something that belongs to a person named Markus.

Markus’s family hosted a delightful dinner to celebrate his latest musical achievement.
Markus’s friends surprised him with a creative painting night for his birthday.

Markus’s, is more common in modern English according to Google ngram. However some people choose to omit the ‘s’ from Markus when the next word starts with an ‘s. That is also correct.

’Markus’ success encourages aspiring musicians.
Markus’ surprise visit made everyone happy.

Markus’

The term Markus’ is another singular possessive for Markus; it has never been as popular as Markus’s althout it appears to be clear when it comes to pronunciations. Use it when you are following the AP style.