Quenya translation for a name, "Whisper of Peace"

Sérë = peace.

lussë = whisper (or possibly hlussë).

Sérëlussë or Sérëhlussë ?

The diaeresis is just a visual reminder to pronounce a final e and isn't necessary mid-word.

I'd combine these elements in an ancient compound as Sérellus(se) or Serellus(se) < PE *sēdē-slussē or a more recent formation Sérelus(se), Serelus(se) with late-period voicing of initial hl-.

Thanks!