I have only met women named [name_u]Flannery[/name_u] (And then there is the author [name_u]Flannery[/name_u] O’[name_m]Connor[/name_m]), so I would personally skip that one for a boy.
[name_u]Love[/name_u] the combo [name_m]Declan[/name_m] and [name_m]Cyril[/name_m].
Also, I can’t resist giving a plug for my personal guilty pleasure: [name_m]Finbarr[/name_m]! [name_m]Finbarr[/name_m] and [name_u]Rowan[/name_u] would be very sweet.
I’d go for [name_u]Rowan[/name_u] & [name_m]Cyril[/name_m]. [name_m]Just[/name_m] because I love both names and an added bonus for me, they’re both the same number of letters long.
[name_m]Declan[/name_m] and [name_u]Rowan[/name_u] are my faves. They don’t really go well together though.
[name_m]Declan[/name_m] and [name_m]Sean[/name_m] sounds good. Very handsome. They sound like spies.
Of these, [name_m]Declan[/name_m] for sure for the first twin. For the second, I’m much less sure–I like [name_m]Cyril[/name_m], [name_u]Flynn[/name_u], and [name_u]Rowan[/name_u] a lot. If I were picking random Irish names (or Irish-inspired), I’d probably end up with [name_m]Declan[/name_m] and [name_u]Rory[/name_u], or possibly [name_m]Declan[/name_m] and [name_m]Ronan[/name_m] or [name_m]Declan[/name_m] and [name_m]Cillian[/name_m]/[name_m]Killian[/name_m]. I love [name_u]Rory[/name_u] and [name_m]Cillian[/name_m] a lot.