Pramantha/Prometheus: a false etymology?

It's often been claimed that the Greek name, Prometheus, was derived from
Pramantha, a fire-stick [Kuhn, Adalbert (1886), Die Herabkunft des Feuers
und des Gottertranks, 2nd ed., Gutersloh: 15 ff. Mayrhofer, Manfred. 1962.
Kurzgefasstes etymologisches Worterbuch des Altindischen. Heidelberg: vol.
2, 567 f; 578 ff.] But the theory has also been attacked [Pauly-Wissowa
Real Encyclopaedie Vol. XXXIII (i) (1957) p. 690. Roscher, W.H.:
Ausführliches Lexikon der Griechischen und Romischen Mythologie, B.G.
Teubner, Leipzig 1884-1937: 3033-3034].

As I'm not a linguist myself, I wondered what Cybalist's opinion was.

Jean Kelly