I'd say LOOS-yen, and to be honest, I really don't care for it. I prefer
Lucian (LOO-see-an), but don't care for that either. I abhor LOOSH-in. It sounds drunk and slurred to me. I adore
Lucas,
Luca and
Luke but, as I remember, you can't stand them.
Lucien RileyLucien Crow
Lucien Benedict (I seem to recall you had some variation of this on your list but I can't remember what it is.)
Lucien MichaelLucien JamesLucien Ray
I'm not very good with boy names, as it turns out.