We are to know and use Jehovah's name, but we must not misunderstand how extremely important it is to Him (and to us). One of God's Ten Commandments, for example commands:
"You shall not misuse the name of Yahweh your God, for Yahweh will not leave unpunished anyone who misuses his name." - Ex. 20:7, NJB [cf. NRSV, NIV, NEB, REB, GNB, NLV, ETRV].
God certainly didn't say, "Don't ever use my Holy Name"! By direct Bible statements and commands and by the clear, thousand-fold repeated examples of all the prophets of God in the OT we know that God's Holy Name must be known and used by his people
God Himself makes it clear in the Bible how important His name is:
"Jehovah ... This is my name for ever; this is my title in every generation." (Ex. 3:15) - NEB
Also:
"O give thanks unto Jehovah, call upon his name; Make known his doings among the peoples." (1 Chron. 16:8) - ASV
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"And, that day, you will say, Praise Yahweh, invoke his name. Proclaim his deeds to the people [nations, RSV, NRSV, MLB, NAB (1991), GNB; worldLB], declare his name sublime." (Is. 12:4) - NJB.
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"For then will I turn to the peoples a pure language, that they may all call upon the name of Jehovah, to serve him with one consent." (Zeph. 3:9) - ASV
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"Fill their faces with shame; that they may seek thy name, [O YHWH]. let them be put to shame and perish .... that men may know that thou, whose name alone is JEHOVAH [YHWH], art the most high over all the earth." (Ps. 83:16-18) KJV
For much more, see
Jehovah - Importance of Name
God's Name