From: Joao S. Lopes
Message: 56425
Date: 2008-04-02
“for instance, that the god Tvas.t.ar is also mentioned in the Avesta as a fashioner of animals pleads for a high antiquity of this tradition; cf. Boyce, 1975 p.81 f.”
(...) and he concludes that the term tvas.t.ar- originally must have been identical with the Avestic word thwor&s^tar-, i.e. ‘shaper’ or ‘fashioner’.(...)
Struggles of Gods: Papers of the Groningen Work Group for the Study of the History of Religions
“Tvas.tr thus became the preceptor of men, and as he existed
from time immemorial, he was called Jurat Tvastr, or the
ancient Tvas.tr, which was corrupted into Zara-thustra^ and
still further, into Zoroaster. (...)
Rgvedic India
This attempt to relate Zarathustra to an euhemerized Tvastr-like Avestan Divine Craftsman is interesting, instead of his name's usual etymologies "camel-driver", or "golden-camel".