Need we know the Name of G-d?

Many people say it is not necessary to find out and call on the true Name of G-d, because, whatever name we use, G-d will know it is He we are addressing our prayers to. How about you – would you rather be called by your own name or something else?
Let us take a mundane example. Say you put up a business and hired some people. At first they called you “boss,” but, being a friendly person, you told them to just call you “Robert,” your actual name. Most cheerfully complied, but some persisted in calling you “boss.” As the business grew, you appointed managers, who were also called “boss” by their subordinates. Sometimes, you and a manager would be talking about something and somebody would come along and say, “Hey, Boss!” and both of you would turn to look. The employee would say, “Oh, not you, I mean him.” Another employee would call you “Albert,” instead of “Robert.” How would you feel?
Names have meanings. In Biblical times the name given to a newborn child was typically about the circumstances surrounding its birth or a prophecy that foretold the character, mission, destiny, or events that would mark the person’s life. Needless to say, if the names of those Biblical characters were important, the importance of the Creator’s Name is inestimably far greater.
One highly important reason G-d revealed His personal Name to men is for us not to confuse Him with false gods. “I am the L-RD: that is my name: and my glory will I not give to another, neither my praise to graven images” (Isa 42:8).
Sound waves and frequencies.
Jewish sages taught that the letters of the Hebrew alphabet each have their own distinctive values and qualities. Letters are sounded through vibrations made with the vocal chords, lips, tongue, teeth, throat, nasal cavity, lungs. Sound travels in waves, with varying wavelengths and frequencies. Thus, every letter and every word made up of a certain combination of letters have their own unique vibrations. So, too, names, which are words.
Every name therefore is one of a kind. The personal Name of G-d, with its own unique set of wavelengths and frequencies, is the one that resonates in perfect harmony with His Being. By revealing His sacred Name to men, the L-RD has given us, as it were, His direct line, much like the numbers of a telephone. He has taught us how to precisely tune in to His personal frequency. When we use a common word or a different name to call on G-d, we are tuning in to a different frequency and, thus, could be communicating with an entity entirely different entity from the one true G-d.
The “Book of Life.”
If you do not value the Name of G-d, He may not value yours, either. G-d has special books wherein your very own name may be written. “Then they that feared the L-RD spake often one to another: and the L-RD hearkened, and heard it, and a book of remembrance was written before him for them that feared the L-RD, and that thought upon his name” (Mal 3:16). That “book of remembrance” is called the “Book of Life” in the New Testament. “And I saw the dead, small and great, stand before G-d; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works” (Rev 20:12). If your name has been written in the Book of Life, a place is reserved for you for an infinite holiday in the Kingdom of Heaven.
The bookings, though, are not confirmed; they can be canceled by the Proprietor. “He that overcometh, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels” (Rev 3:5).  “And there shall in no wise enter into it any thing that defileth, neither whatsoever worketh abomination, or maketh a lie: but they which are written in the Lamb's book of life” (Rev 21:27). If your name is removed from the Book of Life, you can look forward to a sure future of nothing but fries and toast. “And whosoever was not found written in the book of life was cast into the lake of fire” (Rev 20:15).
See how important names can be?
Christ taught the Name
Christ taught His disciples to honor the Father’s holy Name. “After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name..." (Matt 6:9).
He said, “I am come in my Father's name” (John 5:43), because on top of being the Father’s representative on earth, He literally has the Father’s Name as part of His own personal Name (to be discussed later).
Christ taught the Name to His disciples. "I have manifested thy name unto the men which thou gavest me out of the world: thine they were, and thou gavest them me; and they have kept thy word… And I have declared unto them thy name, and will declare it: that the love wherewith thou hast loved me may be in them, and I in them" (John 17:6,26).
Blessings of the Name
G-d made promises for those who will know and call on His holy Name. “Our help is in the name of the L-RD, who made heaven and earth” (Ps 124:8). He will not abandon believers who come to Him for help. “And they that know thy name will put their trust in thee: for thou, L-RD, hast not forsaken them that seek thee” (Ps 9:10). Calling on His true Name is comparable to being enclosed by the thick walls of an impregnable fortress. “The name of the L-RD is a strong tower: the righteous runneth into it, and is safe” (Prov 18:10).
Honors, long life, salvation.
G-d promises to answer and grant protection, honors, long life, and salvation to those who will call on His Name. “Because he hath set his love upon me, therefore will I deliver him: I will set him on high, because he hath known my name. He shall call upon me, and I will answer him: I will be with him in trouble; I will deliver him, and honour him. With long life will I satisfy him, and shew him my salvation” (Ps 91:14-16).
His Name can save the faithful, even from the brink of death. “The sorrows of death compassed me, and the pains of hell gat hold upon me: I found trouble and sorrow. Then called I upon the name of the L-RD; O L-RD, I beseech thee, deliver my soul. Gracious is the L-RD, and righteous; yea, our G-d is merciful. The L-RD preserveth the simple: I was brought low, and he helped me. Return unto thy rest, O my soul; for the L-RD hath dealt bountifully with thee. For thou hast delivered my soul from death, mine eyes from tears, and my feet from falling. I will walk before the L-RD in the land of the living” (Ps 116:3-9).
End-time survival. Come the wars and disasters prophesied in the Bible, G-d’s Name will save the faithful from destruction. “And it shall come to pass, that whosoever shall call on the name of the L-RD shall be delivered: for in mount Zion and in Jerusalem shall be deliverance, as the L-RD hath said, and in the remnant whom the L-RD shall call” (Joel 2:32). Even if mankind is decimated, those who invoke His true Name will survive.      “And it shall come to pass, that in all the land, saith the L-rd, two parts therein shall be cut off and die; but the third shall be left therein. And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The L-RD is my G-d” (Zech 13:8-9).
Sadly, G-d’s promises exclude the wretched multitudes who do not know or neglect to call on His Name. “Pour out thy fury upon the heathen that know thee not, and upon the families that call not on thy name: for they have eaten up Jacob, and devoured him, and consumed him, and have made his habitation desolate” (Jer 10:25).

(Excerpted from Chapter 10, The Personal Names of God, of THE DEEP THINGS OF GOD: A Primer on the Secrets of Heaven and Earth by M.M. Tauson)