Well I'll be damned. I learned a great new word (in two languages) this morning.
n. The ability to attract others through personal magnetism and charm.
[Spanish dialectal, charm, from Spanish, ghost, from Old Spanish, owner, proprietor, from duen de (casa), lord of (a house) : duen, lord (from Latin dominus. See dem- in Indo-European Roots) + de, of (from Latin d. See de-).]
But a few other sources say that duende means "hob, sprite, puck, elf, goblin" in Spanish. (I can see how the etymology evolved and how one is really a characteristic of the other, but wonder why the good people at Dictionary.com got it so wrong. )
Bilingual superfriends to the rescue ... how common is this word en Espanol? I've never encountered it as such — instead, I've used pícaro to describe people with these qualities.