Agree with mathanxiety, there are different types of Irish names
There are old and new Irish language names ranging from Niamh to Siun to Naoise. these are all names used in Ireland but some were rare - getting more popular now.
There are names that are "english" no Irish spelling but that are traditionally used in Ireland - Mary, Patrick, Anastasia, Alice, Kathleen etc. Florence is actually a name used traditionally for men in West Cork (almost all of them become Flor). I believe there was a tradition of Hyacinth for men too in some families in west cork.
I picked 2 "Irish language" names and 1 "traditionally used in Ireland" for my kids - like a Niamh, Seamus and Kathleen.
And then there are Irish-sounding names and Irish words that would never have been used as names that people are now using - Einin (with a fada) would be in that category. If it is an Irish word, Fraoch would be the same. I would be wary of using a name like that unless you were something of an Irish speaker (or madly in love with the name).
Good luck OP. loads of lovely names out there. I think Kathleen could be very retro and lovely.
By the way, Clodagh was a made-up name of its time. Think one of the anglo-Irish aristocracy in Waterford named his daughter after the river clodagh. Fiona apparently also made up by Walter Scott.