Whatever his username is meant to be, it's not Irish. W isn't even a letter in Irish. I've no idea what it's meant to be.
I never said that his user name was Irish. I said only that
he was Irish—as indeed he is. The points that led me to the limerick, which has been a great favorite of mine for thirty years, were as follows: Irishman with unpronounceable screen name → famous Irish writer and wit → limerick mocking unpronounceable words by said famous writer.
I did say that I despaired of understanding how to pronounce his name, but the native language of the Irish is by no means the only one that can lay claim to generating unpronounceable names.
Try pronouncing "Mawrdew Czgowchwz" for a while, and then let me know how your lips and gums feel.