[HIDEK6]

My source is “The Elements of Style” by Strunk and White. This document was published in 1918 and has long served as the bible of journalistic style.

A person as old as you should be familiar with it.

You can google the book by that name. It is 51 pages long.

The rule, stated on page 11 reads, “Form the possessive singular of nouns by adding ‘s. Follow this rule whatever the final consonant.”

I find this rule to be clear and unambiguous.

The same rule can be found in the Merriam-Webster pamphlet covering the same subject matter.

[Jamestown1630]

Suit yourself.

But you may want to argue with all of these people; I doubt they’re all ignorant of correct spelling and punctuation:

https://www.eldersdigest.org/en/2014/2/in-jesus-name,-amen

https://www.cslewisinstitute.org/resources/in-jesus-name-amen/

https://justdisciple.com/christian-prayer-endings/

https://biblemesh.com/blog/why-do-we-pray-in-jesus-name/