Orcrist is not, as far as I know today anyway, attested as Ecthelion's sword...
... I too have read the fan argument[s] on the web, but any that I have seen are largely based on details from The Book of Lost Tales (and still only conjecture) -- details that we have no certain way of knowing Tolkien was even going to retain however.
In the updated (but unfinished) Fall of Gondolin [long prose version, Unfinished Tales] Tolkien describes the notable spike on Ecthelion's helm, possibly indicating that JRRT was still going to have Ecthelion slay Gothmog by spiking him with his helmet and falling with Gothmog into the fountain.
JRRT does not name Ecthelion's sword here, in any case, although obviously we do not get to the part where the great battle takes place.
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