Even the scripture you point to is of the Passover Seder and not the euchrist.Christians can call it eucharist, amongst other things. We get it from scripture.
καὶ εὐχαριστήσας ἔκλασε καὶ εἶπε· λάβετε φάγετε· τοῦτό μού ἐστι τὸ σῶμα τὸ ὑπὲρ ὑμῶν κλώμενον· τοῦτο ποιεῖτε εἰς τὴν ἐμὴν ἀνάμνησιν. 1 Cor. 11:24
There's a number of references like this in scripture.
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