[name_f]Gwen[/name_f] [name_f]Presley[/name_f] and [name_f]Gwen[/name_f] [name_f]Catherine[/name_f] are both lovely! I think either are fine with your surname, but if you’re not convinced, what about a variant of [name_f]Catherine[/name_f]? Like:
[name_f]Gwen[/name_f] [name_f]Catharina[/name_f]
[name_f]Gwen[/name_f] Katrina/Caitriona
[name_f]Gwen[/name_f] [name_f]Presley[/name_f] [name_f]Kate[/name_f]
[name_f]Gwen[/name_f] [name_f]Catalina[/name_f]
[name_f]Gwen[/name_f] [name_f]Kitty[/name_f]
[name_f]Gwen[/name_f] [name_f]Katya[/name_f]
[name_f]Gwen[/name_f] [name_f]Kaja[/name_f]
I think [name_m]George[/name_m] and Kieran/Ciaran are both lovely with your boys—here’s some additional ideas:
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Everett[/name_m] (or Elliot)
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Vincent[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Lorcan[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Max[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Simon[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Desmond[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Truett[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Hugo[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Declan[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]August[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Winslow[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Felix[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Oscar[/name_m] (or Oliver)
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Frederick[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Finn[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Calvin[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Theo[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Sebastian[/name_m]
[name_m]Graham[/name_m], [name_m]Rhys[/name_m], and [name_m]Seamus[/name_m]
Good luck!