Do you mean they just pronounce the "eur" part like in French? Or do they actually say day-rye-eur? It would sound really weird to pronounce the word like in French.
"Duh-rail-yer" is the only pronunciation I've heard, which is presumably some sort of half-hearted attempt to keep it sounding "foreign" without using phonemes that most English speakers would struggle with (particularly the 'r').
