Marcus or Marcus's

[Mehrida]

I'm making a treasure box for a friend's DS. I can't decide if it should say Marcus' or Marcus's.

It is driving me loopy. I'm pretty sure they're both correct, but can't decide which looks better.

Why couldn't he just be Marc?

Help please oh wise MNers!

both correct. I prefer Marcus'

I think Marcus's is correct. But I need to know for certain too, as my own son has a similar name! Help!

Go with Marcus's, it's how you say it. What's the actual wording? Can you rework it so the possessive isn't needed?

Watchhing with huge interest as that's my sons name - and I never know either!!!!

Watching with interest, I have a Douglas!

I was convinced Douglas' was correct, but I'm not entirely sure....

If it was Mark, then Mark's would be correct. But if the word ends with an s then you can use either, and both are correct.

Both are correct.

As Steppemum and Squever have said, both are correct.

My son's name is Thomas. I always say Tom's.

Marcus'.
I have a Thomas and the famous London hospital is Saint Thomas' so I am going with that. Plus the fact he would say his name hasn't got two S in it.

I was pretty sure they were both correct, but you know when you start doubting yourself?

I just want to write:
Marcus'/Marcus's treasure box
Short of writing 'The treasure box of Marcus' I'm at a bit of a loss as to how to reword - suggestions welcome!

I think Marcus' looks tidier but I generally go with the 'how you would say it' rule, in which case it's be Marcus's.

Which does your friend prefer? Both are correct. I'd prefer Marcus's, but a friend's DS has a similar name and I know she has Marcus' room on a sign on his bedroom door. Does he have a convenient surname you could use as well, to sidestep the dilemma?

My son's name ends in s. I much prefer s' to s's which although also correct, I feel seems wrong.

This
TREASURE BOX
belongs to
Marcus

That would be a good idea if his surname wasn't Smithers. Just kidding ;).

Good idea to check how his DM spells it, off to trawl back Facebook photos of him now to see if she's mentioned it.

I really am overthinking this now. I know I am, but I've committed to it now!

I like Lechat's solution too.

Well ladies you inspired me. I went for writing 'treasure in different colours round the outside of the wee label. Then I wrote Marcus in the middle. (And stuck sparkly dinosaurs round it, but that may not be relevant.)

Thanks all! :)

*'treasure'

This phone is not my friend in Pedants' corner.