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The Eucharist is not used in the Gospel directly, even though a related word is spoken by Jesus at the Last supper:

και δεξαμενος ποτηριον ευχαριστησας
And having taken the chalice, he gave thanks (Luke 22:17)

Yes, the Last Supper is the first Eucharist. It can be called the Lord's Supper also.

What Jesus did was precisely the Passover Seder. As the Rabbi present He performed the celebration precisely until the last cup of wine, which He passed to His disciples telling them to drink all of it in RMEMEBRANCE of Him, but He pour out the last portion instead of taking the final drink of it, stating He would not drink of THIS FRUIT OF THE VINE AGAIN until in the Kingdom with them.

Jesus, by catholic heretical reasoning that the chalice contained the Blood of Jesus, was either lying to His disciples calling the cup contents wine but giving them blood, in violation of the Law as recorded in Leviticus (unlikely since He was not yet sacrificed for sin so He would not have made His disciples break the Law), OR Jesus turned the contents back into wine just before He poured the last out and made His proclamation about not drinking the fruit of the vine at that Passover ending. In the latter case He would still have caused His disciples to violate the Law before He went to the Cross as the Lamb of God, in which case He would not be without spot or blemish for the next Day sacrifice of Himself for the sins of the world.

Since we have the words of Messiah Himself calling the cup contents WINE, which is it, catholic? Did Jesus lie to His disciples (or is catholiciism in error calling the contents blood camouflaged as wine), or did Jesus turn the blood back into wine before calling it wine as He poured it out [ wine according to Luke's iteration of the Passover Seder]?

The solution to such a seeming dilemma is to read the text as it is, with JESUS identifying the cup contents as wine, fruit of the vine, demonstrating the sacred metaphor for His disciples. This reading then does not contradict the LAw and aligns with the vast majority of scriptures where Jesus used metaphor to confound the chasers after signs and the twisters, but then clarified the teachings for His faithful disciples.

Catholicism as practiced is not Christianity. It is another religion, a religion in which pagan rites and practices (like imagining the adherents eat the actual body and blood and thus the divinity of the pagan god) are installed over the Gospel of God's Grace in Christ toward humankind. This heretical installation empowers an institution of priests and Bishops and a pope, but does not lead to the narrow gate to Heaven.

As final example, the following assertion is contradictory to what The Bible teaches, yet is at the heart of the catholic religion: "Sanctification is the process of drawing closer to Christ both in faith and in works, which results in salvation at the time of death." post #574
The catholic apologist erringly assigns sanctification as a works based means to deserve salvation at the time of death. God tells us differently in the Bible, that Salvation is the moment we are born from above, followed by His process of sanctifying us during the remaining lifetime of being alive in Christ, as a member of The Body Of Christ.

It can be called the Lord's Supper also.

That's mighty kind of you.