When not going out of our way to use good Spanish, we always say Juan as WAHN. A lover is called a Don Juan, Don WAHN. The pronunciation JOO-'n is exclusively used for Byron's hero, and probably very few people these days know they should say JOO-'n, not WAHN.

KWIKS-'t is also dying out. Almost everyone except me now says ke-HOAT-ay or ke-OAT-ay. (Unless they go for holidays on the Costa Brava and imagine they can trot out a KH.)