Don't feel too bad, Nigel. Carrot being both Welsh (Pratchett has always tended to make the 'true' dwarves "Welsh", vice the 5th Elphant frex, they're miners & drunkards, 'nuff said... ;-) ) & simple is a coincidence. And the real joke, of course, is that Carrot isn't, & never has been, simple.

Unworldly originally, but not stupid. Strait-laced & inexperienced, but... Latterly, frequent asides & inferences show just what a nasty ticking, logical, copper's mind Carrot hides behind his "I'm just a dumb plod, honest" facade...

And if "the Welsh for 'carrot' is 'moron'", it only goes to prove the subtlety of Pratchett's humour!