Eithne,Ethna and Ethnne and other spelling variants are generally pronounced Ethna
. It is rather out of date name and you don't meet many younger Eithnes.
However a confusion has arisen among non-Irish speakers and people who live outside Ireland
about the pronounciation of this name. This is because a lot of people first encounter it through the singer Enya
. En-ya is a regional,minority pronounciation of Eithne
. The singer is a native speaker(Irish as first language speaker)from Donegal. The most notable effect of this dialect is a slurring of constanents. Thus Máire becomes Moya, Eithne
becomes Enya,etc. However not all Eithnes from Donegal pronounce it Enya
. The only Eithne
I've met under 50 is "Eth-na".
I have noticed in recent years a popularity in Enya
as a given name.