Genitive+Proper names: Julia's mother OR James's mother

[Natana Maici]

Hello. I have a doubt concerning the genitive case with proper names that end in "s". For example:

Julia's mother

James's mother.

Is there a rule that says we could write James' mother, with no "s" in the ending?

Natana Maici

[Conchita]

Common usage seems to be divided. After a name ending in ‘s’, you can use either an apostrophe only or ‘s, depending on what you think sounds right. Thus, yes, you can write James’ mother, although some prefer the 's suffix for one-syllable words.

Note that the possessive of the names Jesus and Moses is traditionally formed by adding an apostrophe alone. (E.g., Jesus' disciples were sleepy; Moses' calling was unique.). The bare apostrophe is also preferred for words ending in -nce (stance'), for example.

[Jamie (K)]

[Conchita]

[Jamie (K)]