So, I guess if I ask how to say "Shou Lung" I'm not gonna get a concrete answer either.
the way i was taught romanized-chinese, it'd be shoh(long on the o, or "show" without the w 'pucker') loong (oo as in "good").
as for other undocumented realms pronunciations - get in line to ask ed or one of his minions. my guess for Luiren is that it's two syllables, by swinging rapidly through the u, and an i that leans towards 'ee'. but you've already heard that, i suppose. i presume you've already checked candlekeep.com?