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Both Caitriona and Catriona are commonly heard in Scotland and Ireland. The name was brought to Ireland by the Anglo-Normans, and is the source of nicknames Cait, Caitin, Caitlin and Triona. Actress Caitrona Balfe has gained recognition for her role on Outlander. Pronunciation is like Katrina.

Caledon, the name of the arrogant Billy Zane character in "Titanic," is an Irish place-name related to Caledonia, the Latin word for Scotland thought to be derived from the ancient Celtic word for "hard." Cal is a wonderful nickname, and Caledon an inventive way to get there.

Calloway is one of those irresistibly jaunty, animated three-syllable surnames, like Sullivan and Finnegan — but this one has the added attraction of jazzy ties to the immortal "Dean of American Jive," Cab Calloway.

Callum, a charming Scottish name high on the list in England, Scotland and Northern Ireland, is rising through the ranks in the US now too. And it comes complete with the easy nickname Cal.

Camden is a surprise hit, probably as a result of some star baby cred: it has been chosen by no less than four celebrity parents since 2012. Gentle but not flimsy, Camden could be an updated spin on Cameron, Callum, or Caden.

Newly popular boys' name could cross over in much the way the related Cameron has.

Caoimhe, pronounced (more properly) kwee-va or kee-va, is a pretty and distinctive Gaelic name but one that could well lead to no end of confusion outside the Irish community. Even in its native habitat, it is sometimes spelled Keeva.

Carson is one of the most long-running popular androgynous baby names, with a dash of the Wild West via the legendary Missouri frontiersman Kit Carson. Dating back to when it was the name of Nancy Drew's Dad, Carson is still steadily in the Top 200 baby names.

Very popular surname choice — it's in the Boys' Top 100 — beginning to catch on for girls. First female association: novelist Carson McCullers.

Pleasant Irish last name that could be a more masculine alternative to the overused Cassidy. Early kings of Leinster bore the name, which relates to the first name Caomhan or Kevin and can also be spelled Kavanagh, Cavanagh, Cavenagh, and Kavanaugh.

Even though the pronunciation of Ceara and the more usual Ciara is KEER-a, most Americans would tend to mispronounce this spelling variation as Sierra.

Celyn, which starts with the hard K sound and rhymes with Helen, is a Top 100 name in Wales although largely unknown outside that tiny, beautiful country. It is usually a masculine name.

Common name in Wales that's all but unknown in the U.S. Certainly an attractive choice ripe for export. In the UK it sits at Number 330.

A handsome Irish name for boys, very popular in that country, but in the US this traditional spelling might cause pronunciation problems. Still, whether Cian or Kian, it's simple and straightforward enough for the initiated. Cian is rising in the British popularity charts. This was the name of several legendary figures, including Cian, son of the god of medicine. His own son was Lugh, the sun god and father of the Ulster warrior Cuchulain and Cian is also the name of the son-in-law of the high king Brian Boru. So very well connected.

Ciara is very popular in Ireland, more familiar here as the Anglicized Kiera or Keira. The uninitiated will tend to pronounce Ciara as the Italian Chiara, a form of Claire—kee-AHR-a or even see-AHR-a, like the American singer-songwriter Ciara. In the US, Ciara peaked in 2005, when it was the Number 150 name; it's since fallen down to Number 882.

Long popular in Ireland and England, Ciarán is the name of Ireland's first-born saint and twenty-five other saints. While this is the authentic Irish spelling, it is more familiar in the US in the Anglicized Kieran spelling.

Cillian is one of the native Irish names that, along with Aiden and Declan, is becoming an unlikely favorite in contemporary America. The Killian spelling has been more popular in the US, but Cillian's star is rising, perhaps thanks to Irish actor Cillian Murphy, star of Oppenheimer and Peaky Blinders.

Clementine is a Nameberry favorite that broke back into the US Top 1000 in 2014 after more than half a century off the list.

A popular choice in Ireland, Clodagh was the name of a river and later a saint. The "cloddy" aspect of the name has prevented it from spreading beyond Ireland, but that could change. Famous namesakes are singer Clodagh Rodgers and chef Clodagh McKenna.