quién
/ˈkjen/ · A1 · pron
who?, whom?
quién = Latin quem (whom); cousin of English who and French qui
Sounds like KYEN, one syllable. From Latin quem, the same qu- question root behind que, cual and cuando. De quién = of whom, so whose. With a past subjunctive (quién pudiera) it turns wishful: if only I could.