Máire Philomena Ní Bhraonáin (Moya) is the sister of Eithne Pádraigín Ní Bhraonáin (Enya).

Clannad were an Irish band formed in 1970 in Gweedore, County Donegal, by siblings Ciarán, Pól and Máire (Moya) Uí Bhraonáin (in English, Brennan) and their twin uncles Noel and Pádraig Ó Dúgáin (Duggan). They have adopted various musical styles throughout their history. Beginning as an acoustic folk group mainly performing rearranged traditional Irish songs in Irish, they expanded their sound with original songs in English, vocal harmonies, electronic keyboards, and elements of rock, Celtic, new age, smooth jazz, and Gregorian chant.

And yes, I'm of Irish descent so I've listened to them quite often.