What's in a Name?

Melchizedek?

1 THERE are, in the church, two priesthoods, namely, the Melchizedek and Aaronic, including the Levitical Priesthood.
2 Why the first is called the Melchizedek Priesthood is because Melchizedek was such a great high priest.
3 Before his day it was called the Holy Priesthood, after the Order of the Son of God.
4 But out of respect or reverence to the name of the Supreme Being, to avoid the too frequent repetition of his name, they, the church, in ancient days, called that priesthood after Melchizedek, or the Melchizedek Priesthood.
(Doctrine and Covenants | Section 107:1-4, bold emphasis added.)

Mormon?

... I may safely say that the word Mormon stands independent of the learning and wisdom of this generation.--Before I give a definition, however, to the word, let me say that the Bible in its widest sense, means good; for the Savior says according to the gospel of John, "I am the good shepherd;" and it will not be beyond the common use of terms, to say that good is among the most important in use, and though known by various names in different languages, still its meaning is the same, and is ever in opposition to "bad." We say from the Saxon, "good"; the Dane, "god"; the Goth, "goda"; the German, "gut"; the Dutch, "goed"; the Latin, "bonus"; the Greek, "kalos"; the Hebrew, "tob"; and the "Egyptian, "mon." Hence, with the addition of "more," or the contraction, "mor," we have the word "mormon"; which means, literally, "more good."
Yours,
JOSEPH SMITH.
(May 15, 1843.) T&S 4:194.¹

If Joseph is right about God being the superior interpreter of language (see full text below at footnote 1), then perhaps Mormon has more meaning than just as a nickname, even if often abused and maligned, though, there is probably no name more abused and maligned in this world than that of the Savior's.

In addition, we have seen in scriptural history how mortal names have been used to reference things that were clearly sourced in God or were substituted or shadowed for His name or the name of His Father, as in:

» The City of Enoch
» The Law of Moses
» Children of Israel
» Son of David²
» Son of Abraham³
» Aaronic Priesthood (Priesthood of Aaron)⁴
» Levitical Priesthood⁴

ON THE OTHER HAND ...⁵

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1. Full text:
Section Six 1843-44, p.300
Here then the subject is put to silence, for "none other people knoweth our language," therefore the Lord, and not man, had to interpret, after the people were all dead. And as Paul said, "the world by wisdom know not God," so the world by speculation are destitute of revelation; and as God in his superior wisdom, has always given his Saints, wherever he had any on the earth, the same spirit, and that spirit, as John says, is the true spirit of prophecy, which is the testimony of Jesus. I may safely say that the word Mormon stands independent of the learning and wisdom of this generation.--Before I give a definition, however, to the word, let me say that the Bible in its widest sense, means good; for the Savior says according to the gospel of John, "I am the good shepherd;" and it will not be beyond the common use of terms, to say that good is among the most important in use, and though known by various names in different languages, still its meaning is the same, and is ever in opposition to "bad." We say from the Saxon, "good"; the Dane, "god"; the Goth, "goda"; the German, "gut"; the Dutch, "goed"; the Latin, "bonus"; the Greek, "kalos"; the Hebrew, "tob"; and the "Egyptian, "mon." Hence, with the addition of "more," or the contraction, "mor," we have the word "mormon"; which means, literally, "more good."
Yours,
JOSEPH SMITH.
(May 15, 1843.) T&S 4:194. (Bold emphasis added.)
found at https://www.boap.org/LDS/Joseph-Smith/Teachings/T6.html (Teachings of the Prophet Joseph Smith, Deseret Book Company, Salt Lake City, Utah, 1970, p. 300).
2. New Testament | Matthew1:1; 12:23; 15:22; 20:30-31; 21:9, 15; 22:42; Mark 10:47-48; 12:35; Luke 18:38-39
3. New Testament | Matthew 1:1
4. Doctrine and Covenants | Section 107:1-4
5. On the Other Hand: Book of Mormon | 3 Nephi 27:3-9 ~ And they said unto him: Lord, we will that thou wouldst tell us the name whereby we shall call this church; for there are disputations among the people concerning this matter. And the Lord said unto them: Verily, verily, I say unto you, why is it that the people should murmur and dispute because of this thing? Have they not read the scriptures, which say ye must take upon you the name of Christ, which is my name? For by this name shall ye be called at the last day; And whoso taketh upon him my name, and endureth to the end, the same shall be saved at the last day. Therefore, whatsoever ye shall do, ye shall do it in my name; therefore ye shall call the church in my name; and ye shall call upon the Father in my name that he will bless the church for my sake. And how be it my church save it be called in my name? For if a church be called in Moses' name then it be Moses' church; or if it be called in the name of a man then it be the church of a man; but if it be called in my name then it is my church, if it so be that they are built upon my gospel. Verily I say unto you, that ye are built upon my gospel; therefore ye shall call whatsoever things ye do call, in my name; therefore if ye call upon the Father, for the church, if it be in my name the Father will hear you;
New Testament | 1 Corinthians 1:12–13 ~ Now this I say, that every one of you saith, I am of Paul; and I of Apollos; and I of Cephas; and I of Christ. Is Christ divided? was Paul crucified for you? or were ye baptized in the name of Paul?
New Testament | 1 Corinthians 3:21–23 ~ Therefore let no man glory in men. For all things are yours; Whether Paul, or Apollos, or Cephas, or the world, or life, or death, or things present, or things to come; all are yours; And ye are Christ's; and Christ is God's.
Doctrine and Covenants | Section 76:98-101 ~ And the glory of the telestial is one, even as the glory of the stars is one; for as one star differs from another star in glory, even so differs one from another in glory in the telestial world; For these are they who are of Paul, and of Apollos, and of Cephas.  These are they who say they are some of one and some of another—some of Christ and some of John, and some of Moses, and some of Elias, and some of Esaias, and some of Isaiah, and some of Enoch;  But received not the gospel, neither the testimony of Jesus, neither the prophets, neither the everlasting covenant.

As we can see, things are not always as cut-and-dried as most of us would like.