Elf -> Elves
Dwarf -> Dwarves
Smurf -> Smurves

@mcnees

Olympix -> Olympices

(but this doesn't apply to Mt. Si, which is a Cascade, or Mt. Washington which is an Appalachian)

@mcnees Half -> Halves
Barf -> Barves
Nerf -> Nerves
@mcnees Smurf -> Smurfs
Dwarf -> Dwarfs
Elf -> Elfs
@mcnees The difference is that the first two are fictional.
@mcnees
Dwarf - > Dwarfs
Roof - > Roofs
Yeh, I'm a smart arse.
Orc -> Orca
Hobbit -> Hobbitseseseses

@mcnees @Lazarou Better example needed. As Tolkien said, “dwarves” was an error.

“No reviewer (that I have seen), although all have carefully used the correct dwarfs themselves, has commented on the fact (which I only became conscious of through reviews) that I use throughout the ‘incorrect’ plural dwarves. I am afraid it is just a piece of private bad grammar, rather shocking in a philologist; but I shall have to go on with it.”

Not that it matters of course. Language is what we make it. So with luck (and an amazingly popular book) you may be able to make smurves cannon. :)

https://jakubmarian.com/dwarves-or-dwarfs-which-spelling-is-correct/

‘Dwarves’ or ‘dwarfs’ – which spelling is correct?

<p class="indent"><span class="drop-i">I</span><span class="after-i">t</span> may come as a great surprise to the fans of The Lord of the Rings, but the correct traditional spelling of the plural of