The pickiest of nits

I am currently reading Zachary Ying and the Dragon Emperor by Xiran Jay Zhao (review for now: it's fine), which contains the following exchange:

"He and I and Ram and Genghis get together and enjoy a few games every few decades."
[...]
"You play mahjong with Alexander the Great, Ramses the Second, and Genghis Khan?"

And I'm like "no! Don't call Ramsès that! It's rude!"

Ramsès is the "translation" of rꜥ-ms-sw, meaning something along the lines of "Ra bore him". Calling him "Ram" cuts off his name in the middle of a hieroglyph.

Now, normally I would say that whether a nickname is rude or not depends on the nicknamee, but Ramsès II has been dead for three thousand slutty slutty years.

It still feels like it would be rude. What do you think?