[name_f]Fiona[/name_f]? That was my first thought. I like the suggestion of [name_f]Tara[/name_f] as well.
[name_f]Sadie[/name_f] would be the most logical alternative and a very beautiful name 
I was also going to suggest [name_f]Sarai[/name_f]. It’s beautiful and not very common, like [name_f]Maeve[/name_f]. It’s not Irish, but still lovely. I like the suggestion of [name_f]Kiera[/name_f]/Ciara and [name_f]Tara[/name_f] if you’re wanting something specifically Irish.