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Sorry, no etymologies found.
However, by the 13th century, reshteh 'string' had supplanted it, and this is now the usual word for a flat, sliced noodle in the Near East.
Persian noodle Homa Movafaghi’s ashe reshteh, 98–99
Homa Movafaghi’s ashe reshteh Persian noodle soup, 98–99
I was hoping for more variety among the vendors’ menus, but everyone had similar offerings: a plate of kebabs, plain rice, a grilled tomato, and the noodle soup called ash-e reshteh.