Ireland was neutral during WW2.So no need for them to have a 1939 National Register And, please note - it was NOT a census!
So, I'm afraid I have to ask the obvious here. The 1939 Register was taken owing to rationing during the War. Was there no food rationing in 'neutral' Ireland? After the War, in 1948, the Register became the basis for the NHS. How was the NHS list compiled in the Republic?