Uccle (French) or Ukkel (Dutch), is in Belgium where both French & Dutch are spoken.
This site pronounces the word in Englsh & in French.
Click next to the word at the top for the Englsh pronunciation & next to the lower word for the French pronunciation.
Mille-fleurs (Mill-ay-Fler)
Mille-fleurs (French) literally means "thousand flowers" and refers to a background made of many small flowers and plants. It was an especially popular motif in the applied arts and crafts during the Middle Ages in Europe.
d' Uccle (Do-U-Clay)
Uccle is a town on the outskirts of Brussels, Belgium
I can't see how the last syllable would be "ay" as there as no acute accent (é) over the 'e'. Not that I'm aware of having been to Uccle or hearing a Belgian person say the name.
I say "millie flur dee-ukkel", and I've yet to hear a judge, or too many other people, pronounce it differently, although I have seen on here that many pronounce it "doo-clay" or many other variations.