What would Rory and Caoimhe brother be called?

[PepperSteaks]

Inspiration please!

Rory, Caoimhe and Lorcan
Rory, Caoimhe and Senan
Rory, Caoimhe and Dominic

Brendan, Finn or Eamonn (due a comeback imo)

Well, definitely not Caoimhín!
Naoise
Iarla
Conn
Seán

Ciaran, Lorcan, Aidan, Fergus, Cormac, Donncha

Tadhg

Lucien
Cian
Flynn
Emmett
Orson

Cahir or another way of spelling it Cathaoir

Shay
Seamus

Niall

Oisin! Lorcan. Cillian. Caolan

Ultan.