Actually, it is named a seraphine most of the time and there seem
to exist no etymologies.

I face somewhat of dilemma myself, as my website and business is
named StentorVox, comprised of two words I assembled to signify the
authoritative voice of the King of Instruments.  Some folks think
it refers to a particular organ rank or stop, which it does not.

Seraphine:

From The Century Dictionary: noun: A musical instrument essentially
similar to the harmonium, of which it was the precursor.  It was
invented in 1833 by John Green. See reed-organ.

From the GNU version of the Collaborative International Dictionary
of English: noun (Mus.):  A wind instrument whose sounding parts are
reeds, consisting of a thin tongue of brass playing freely through
a slot in a plate.  It has a case, like a piano, and is played by
means of a similar keyboard, the bellows being worked by the foot.
The melodeon is a portable variety of this instrument.

From Wiktionary: noun music: An early wind instrument with a keyboard,
resembling a cross between a reed organ and an accordion, which makes
its sound by the action of air being blown across metallic reeds.

Etymologies: Sorry, no etymologies found.

Paul Kealy
http://StentorVox.com/ 

 [ See also https://www.urbandictionary.com/define.php?term=Seraphine 
 [ -- Robbie