Unusual but not wacky boys names

[Boysnamesareharrd]

I'm pregnant with my second and really struggling for boys names. Our first child has a more unusual name, along the lines of Otis, Rowan, Archer etc.
I need a similar idea for child two, starting with c or a would be ideal. Easily shortened to one syllable. A bit more unusual because DH is a teacher so wants a special name, not one he associates with other children.
Does such a name exist? Please help!

What do you mean by unusual? Rowan and Otis are both popular at the moment, so is it more names which you didn’t go to school with, but currently a bit trendy? These are all out of the top 200, and some are trendier than others.
Abel
Alistair
Angus
August
Avery
Casimir
Caspar
Cedric
Rufus
Stellan

Cosmo
Ayrton
Arlo
Arley
Christian
Amos
Conlan
Corbin
Anton
Asher

I actually love the name Archer my partner vetoed it he loved Axel which I vetoed we finally settled on Dexter

Good luck

Apollo
Atticus
Alvin

Cassius

I really liked Gabriel (Gabe) and Ambrose but they might be pushing the boundaries of weirdness a bit.

My daughter has a name that I have never, ever heard of on anyone else so I do like weird names.

Caleb
Alistair

Ashley

Ambrose
Aiden
Angus
Orson
Otto
Magnus
Jasper
Ezra
Cory
Conan
Clement
Carson

Elijah
Isaac
Gabriel is great
Nathaniel

Arlo
Asher
Abbott
Acer
Ainsley (Harriett)
Ambrose
Amos
Anders
Aries
Apollo
Arnaud
Atlas
August
Austin
Cane
Clarke
Caleb
Cohen
Calyx
Cyprus
Colby

Cora
Capri
Cassia
Celeste
Coral
Circe
Abia
Abra
Alice
Aurora
Acadia
Athena

Caspian

Christian

Apollo
austin
asher
arlo
atticus
auden
axel
ambrose
artto
arden

casper
caspian
cassian
cassius
cedric
clyde
chester
cole
cyrus
caius
cameron
caleb
chase
carter

Cory
Cody
Cormac
Caden

Hunter
Tate
Archer is lovely
Cooper

Camden
Callum
Clark
Connell/Conall
Corbin
Colby
Cato
Caius
Crew
Cruz
Clay
Cole
Koda
Kit
Kent

Bellamy
Flint
Fitz
Enzo
Talon
Penn
Spencer
Harley
Pax
Salem
Ford
Maddox
Knox
Troy
Lincoln
Dawson
Palmer
Rafferty nn Rafi
Wells
Bennett nn Ben
Alaric
Griffin nn Fin
Gideon
Dario
Monty (Montgomery)
Rhodes
Dimitri
Grant
Anton
Neil
Murphy
Miller

Thanks everyone. Like a walk down memory lane, so many names I toyed with for my first but were vetoed by my husband haha.
In answer, ds name is more on the unusual side, not in top 100, like a few of the more obscure names people have suggested, my examples weren't the best(although a few were from previously vetoed list haha)
Just to complicate matters, I'd like a Celtic name.
Impossible task I know haha!

Not necessarily beginning with A or C but how about
Raphael
Caspar
Quentin
Magnus
Fabian

I actually really like Christian but as we're agnostic/athirst DH will definitely say no lol.

Aubrey
Sholto

Abel
Angus
Abraham

Cillian
Carl
Caleb

Caius
Silas
Jared

I have a Cole.
I have never met another boy called Cole

How about Euan or Connor? Not too out there but not that common either

You might like some of the names on my list. Although DH disagrees with me on a lot of these!
In no particular order:

August
Evan
Frank
Lex
Jago
Noel
Leo
Otis
Byron
Lincoln
Amos
Heath
Jonah
Ash
Rowan
Jake
Jared
Ezra
Seth
Judd
Silas
Gabriel
Ray
Sidney
Jed
Blake
Felix
Vincent
Miles
Rafe
Saul
Abel
Asa
Bram
Cain
Rex
Rufus
Ivo
Orson
Axel
Jarvis