What is the deal with JKR and names that end in "S"?

Albus, Remus, Severus, Sirius, James, Scorpius...

It's like she thought to herself, "How can I make my character's names as annoying as possible? Oh, yes, I can end all 8,000 of them in S."

/rant

LOL, not really a big deal, but my fingers sometimes forget to actually add an 's at the end of those names, so I end up with a fic full of James (or occasionally Jame's) and no James's, which makes editing super fun.