I found Ciarda historically used in
Ireland at
http://www.ucc.ie:8080/cocoon/doi/atlas?section=N172DC
And in modern times, used by Ciarda
Tobin (Irish theatre director from Limerick): "The two artists involved are
Joanne Beirne from Roscommon town and Ciarda
Tobin from Limerick. The paths of the two women have crossed on several occasions, (...)"
http://www.roscommonpeople.ie/itemdetail.asp?itemID=1249
All the references of use in
Ireland that I find are related with women.
Lumia
http://onomastica.mailcatala.com