Cathan -Cathán is Gaelic boy's name which contains the element cath referring to battle. The name meaning is something like "little battler".
It is also the name of a 6th century Irish monk who became a Saint and had some churches dedicated to him in Scotland.
Cian -Cian is a boy's name of Irish origin meaning "ancient and enduring".
Cliona -Cliona is a name of Irish origin mentioned in folklore. Cliodhna was a fae woman who had magical birds whose songs could heal the sick. The name means "shapely".
Colin -Colin is a boy's name of Irish origin meaning "little chieftain".
Conall -Conall is a boy's name of Irish origin. It may mean "friendship" or it may mean "mighty hound".
Conan -Conan is a boy's name of Irish origin meaning "a hound" or "swift footed warrior" or "little warrior" or "little hound".
Cory -The name Cory is a Celtic name that can be used for either a boy or a girl. It may come from the Gaelic word for "ravine", from the Irish word for "Hollow", the Scottish word for "seething pool" (or perhaps a bubbling cauldron) or the french word for "horn".
Craig -The name Craig is a boy's name of Gaelic origin meaning "cliff" or "rock".
Crevan -Crevan is a boy's name of Irish origin. It means "fox".
Daire -Daire is an Irish name that can be used for a boy or a girl though it was a man's name in the Ulster Cycle legends. The name means "fertile, fruitful".
Daireann -Daireann is a girl's name of Irish origin meaning "bountiful, fruitful".
Daisy -Daisy is a girl's name referring to a rayed flower in the aster family. The word daisy comes from Old English dægeseage, meaning "day's eye" in reference to the sun.
Daren -Daren is a Welsh name meaning "burnt land" or "hill"
Davin -The name Davin is derived from the Irish name Daimhin (pronounced Daw veen) meaning "little deer".
Dorcha -Dorcha is a female name of Irish origin meaning "darkness"