vintageluvs's list "Unusual Names Used by European Aristocrats" of 20 great name ideas: Alethe - Clodagh!

Unusual Names Used by European Aristocrats

Alethe

Alswen

Alured

Amasa

Anayetta

Andalusia

Armine

Arnolph

Arnrid

Assur

Bryony is an unusually strong plant name --the bryony is a wild climbing vine with green flowers --that caught on in the U.K. before sprouting here. The name of the young character in the Ian McEwan novel Atonement is spelled Briony, which is the variation and Bryony the original.
 Bryony sounds a lot fresher than the now dated Brittany. Pronunciation is like Brian with an ee at the end, though the name bears no relationship to the male Brian or Bryan.

Bryony

Bethuel

Blazius

Bompon

Bouchard

Gentian

Georgemma

Bunty

This name was used by Shakespeare (who got it from Plutarch) in Antony and Cleopatra for one of the attendants of the Egyptian queen. An interesting possibility, it is heard occasionally in the UK, even less frequently in the US.

Charmian

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 with the rise of other Irish choices like Maeve and Orla.
 
The name was first used back in the 19th century, when it was chosen by the Marquess of Waterford, the County through which the river runs. The first bearer, Lady Clodagh Anson, a philanthropist and writer, also gave the name to her daughter, and hoped it would stay a rarity. 
 
It has gone on to rank in the Top 50 in Ireland and the Top 25 in Northern Ireland and in a recent year, ranked just outside the England and Wales Top 1000. Pronounced as KLAW-duh or KLO-duh depending on region, it shares similarities with Chloe, Clara, Cleo, and Clover.
 
While the exact meaning of the name is unknown, it has been suggested it means "stony river" or "muddy banks".
 
Famous namesakes are singer Clodagh Rodgers and chef Clodagh McKenna.

Clodagh