Help! Need a boys name to go with 2 big brothers!

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Hi, I am expecting DC3 in 6 weeks time.
We have 2 DS's already - Noah Isaac and Casper Jack and are totally and completely stumped for boy's names.
We don't know if DC3 is a boy or a girl but have a potential girls name sorted - just struggling massively to find a name we love as much as our other son's...especially now we are having to find a name that 'fit's' the others.
Discounted names are Ethan (too popular), Elijah (don't like any nn), Lucas (too popular AND don't like any nn)....any fitting suggestions would be greatly welcomed!

OK well I like your names and on the basis that I have an Isaac, and all your other names were on our lists of potentials over the years (including Elijah!), I'll just type boys names I like!

Rafferty
Dominic
Adam
Zachary
Jonah
Jude
Reuben
Sebastian
Archie
Alfie
Seamus
Joshua
Oliver
Bertie
Rufus

Oscar :)

I know a Casper who has a brother Hector.

Thanks for the replies so far!
feckwit lots of great suggestions and lots of names we have considered too...I love Rafferty but DH not so keen and one of those names is on my (almost non-existant but sort of) shortlist! There are also a few on there not considered so I will run them past DH later!!
Ichodge - acouple of friends had suggested that and I had forgotton about it - another possible!
bruffin - funnily enough DH suggested this yesterday but it doesn't appeal to me
Keep 'em coming!

William
Milo
Christian
Lawrence
Felix
Aidan
Gregory
Peter
Edwin
George
Tristan

Jonah

I'd choose another 2 syllable name to go with Casper and Noah. I like
Lucas
Quentin
Marcus
Thomas

Aidan, Ellis, Archie, Arthur, Caleb, George, Leo, Lennon.

Go for Jonah and you'll have a full house of biblical names. As in, I think you should, not a criticism.

I was going to suggest Caleb too!
Samuel
George
Harry
Thomas
Seth
Joseph
Leon

What about Eli instead of Elijah? That's my ds name. We love it. I also like Ralph and Hugh. And Joseph. And Rocket but I wouldn't have the nerve myself.

I think we have similar taste in names (and I also have 2 boys) so how about..
Seth (3rd son of Adam & Eve) Jonah, Micah, Jacob, Toby, James, Patrick, Eric, Edward, Joseph, Peter, Samuel, Alexander, Sebastian, Henry

Finn Elijah came to mind.

Reuben

Ezra

Leo

Thanks again for all the new suggestions - a lot of name discussions were had in our house last night!
My husband's and 3 nephews names are all amongst the suggestions as are some very good ideas!