Aarav

Aban

Abdiel

Abdullah

Abel

Abram or Abraham

Abrose

Absalom

Ace

Acston

Ada

Adain

Adda

Addie

Adelard

Adeon

Aderyn

Adie

Adonis

Adrian

Adriel

Aeddan

Aelwyn

Aelwyn, Elwyn

Aeron (An unusual boy's name)

Afan (Celtic saint's names, name of a river)

Afon  

Ahmad

Ahmed

Alasdair

Alastair

Alaw

Albert

Alden

Alec

Alecs

Alecsander

Aled (Offspring)

Alejandro

Alessandro

Alfie

Alfin

Alfred

Alistair

Allaster

Allie

Alonso

Alpein

Alphonsus

Alpin

Alun  

Alwyn  

Amari

Ami

Amos

Anarawd (Undisgraced, free of shame)

Andi

Andras (Man, warrior)

Andras/Andreas

Andreas, Andras

Aneas

Aneirin (Modest, noble)

Aneurin (Truly golden)

Aneurin, Aneirin

Angelo

Angus

Angws

Angwyn (Very handsome)

Anhun

Ansley

Antonio/Anhun

ap Adda

ap Aeddan

ap Andras

ap Ben

ap Cennydd

Ap Dafydd

ap Deri / ap Derwyn

ap Gethin

ap Gwilym

ap Hari

Ap Iago

ap Ianto

ap Ioan

ap Llwyd

ap Llywelyn, Llewelyn

Ap Madoc

ap Nel, ap Aneurin

ap Nicolas

ap Pedr

ap Rhys

ap Robert

ap Siamas, ap Iago

ap Sieffre

ap Sion

Apollo

Aran or Arawn

Aran/Arawn/Aron

Arawn (Unrestrained wildness)

Arawn, Deri

Archibald

Archie

Arddwr

Ares

Arglwydd Bach

Ari

Arjun

Arlo

Armando

Armani

Arnold

Aron

Art (Bear hero, A rock)

Arthfael (Warrior prince)

Arthur

Arthus (Bear hero, A rock)

Arwel (Prominent)

Asher

Ashton

Askill

Atawn (Harmony)

Atlanta

Atlas

Atticus

Aulay

Avery

Awst

Awstin  

Awyr

Ayaan

Ayrton

Bailee

Bailey

Barcer

Bari, Berwyn

Barnabi

Barney

Barrett

Bart

Bartholomew

Bartley

Basil

Baylor

Beckett

Beckham

Bedwyr (A knight of King Arthur)

Beiron

Ben

Benedict

Bennett

Bensiamin

Bentley

Bernard

Bert

Berti

Berwyn  

Bethan

Bilal

Blain

Blaine

Blair

Blake

Blakely

Bleddyn  

Bledig (Like a wolf)

Bledri

Bo

Bob, Robat

Bobi, Robat

Bodhi

Bodie

Boone

Boston

Bowen (Son of Owen)

Bowen, ap Owen

Brad

Braden

Bradley

Brady

Braith (Diversely-coloured)

Brân  

Brantley

Branwaladr

Braxton

Braylen

Braylon

Breichiawl

Brenhinol

Brenin  

Brenin Bach

Brenin, Rhodri

Brett

Briain

Brian

Brien

Briggs

Broch

Brody

Bronfraith

Brown

Bruce

Bruno

Bryant

Brychan  

Bryn  

Brynllyn

Brynmor  

Buddug, Nicita

Bugail

Cad

Cadell  

Caden

Cadfael  

Cadfael/Cadwaladr/Cadwallon

Cadfan (Battle raven)

Cadi

Cadno, Llwynog

Cadoc (Battle)

Cadog/Cadfael

Cadwalader (Battle leader)

Cadwaladr

Cadwgawn (Battle glory)

Caerwyn (Fair love)

Cai  

Caiden

Cailín

Cain

Cairo

Caison

Calan

Caleb

Cali

Calum, Malcolm

Cam

Camari

Camden

Cameron

Cân

Canon

Caradoc (Dearly loved)

Caradog

Carina

Carl

Carl/Siarl

Carlo/Siarl

Carmel

Caron  

Carreg Thor

Carson

Carter

Carwyn (Dearly loved)

Câs

Casen

Cash

Cashton

Casi

Casiws

Cason

Cassidy

Cassiel

Cathel

Catrin

Cawrdaf

Caysen

Cedrych (Bounty, Spectacle, Founder)

Cefin  

Ceinfryn

Ceiton

Celer

Celfin

Celsi

Celyn  

Cen

Cendrig

Ceni

Cennydd

Cerdin

Ceredig/Caradog

Ceri (To love)

Certiwr

Cesar

Chaim

Chase

Chi

Chwedl

Cian

Cianan

Cieran

Ciffer

Cilan

Cilian

Cilin

Cîran, Gethin

Ciri

Cîth

Clarc

Clayton

Cledwyn  

Clei

Cleif

Clement

Clifford

Clinton

Clud

Cobi

Coda

Codi

Coel

Coen

Cohen

Colbi

Coleman

Colin

Coll

Colman

Colmisil

Colomen

Colson, ap Col

Colt, Ebol

Colton

Columba

Colwyn  

Coman

Conel

Conleth

Conrad

Conway (Hound of the plains)

Conwy (Hound of the plains)

Corbin

Cori

Cormag

Corneliws

Corsyn

Corwy

Cowper

Craig

Crib

Cris

Crisiant (Like a crystal)

Cristian

Cristion

Cristoffis

Criw

Croes

Crosby

Crystin

Cuthbert

Cwrtis

Cynan

Cynddelw (Exalted effigy)

Cynddylan

Cyndeyrn

Cynfarch

Cynfor (A great chief)

Cynon

Cynwrig (High hill)

Cyril

Cystennin