Welshmen are most prominently mentioned as a flavor of British soldiers, in the museomound vignette, and in HCE's sin in the park
"Penetrators are permitted into the museomound free. Welsh and the Paddy Patkinses, one shelenk."
"This is the three lipoleum boyne grouching down in the living detch. This is an inimyskilling inglis, this is a scotcher grey, this is a davy, stooping. This is the bog lipoleum mordering the lipoleum beg. A Gallawghurs argaumunt. This is the petty lipoleum boy that was nayther bag nor bug. Assaye, assaye! Touchole FitzTuomush. Dirty MacDyke. And Hairy O'Hurry. All of them arminus-varminus."
"This is the pettiest of the lipoleums, Toffeethief, that spy on the same Willingdone from his big white harse, the Capeinhope. Stonewall Willingdone is an old maxy montrumeny. Lipoleums is nice hung bushellors."
"he lay at one time under the ludicrous imputation of annoying Welsh fusiliers in the people's park"
Welsh language [fweet-95]