Just a small list of names here, because... well just because.... *shrugs*
(May or may not have already been done before but I can't remember nor find it so bleh....)

(Names are in order for once! From oldest to near youngest (as Arthur and Ollie are technically the youngest))

1ps-

Scotland: Alistair ("defender of man")

Ireland: Seamus (Irish form of James)

Northern Ireland: Patrick ("patrician" or "noble")

Wales: Dylan ("great tide")

2ps-

Scotland: Ian (Scottish form of John)

Ireland: Seán (Irish form of John)

Northern Ireland: Aiden (anglicized form of Aodhán meaning "fire")

Wales: Heddwyn ("blessed peace")